sutter buttes

he Sutter Buttes are a small circular complex of eroded volcanic lava domes which rise above the flat plains of the Central Valley of California in the United States. The highest peak, South Butte, reaches about 2,130 feet (650 m) above sea level. The Buttes are located just outside of Yuba City, California in the Sacramento Valley, the northern part of the Central Valley. They are named for John Sutter, who received a large land grant from the Mexican government. The Sutter Buttes also hold the title of being the world's smallest mountain range.[1]
Contents [hide]
1 Natural history
2 Native American lore
3 Recent history and access
4 Gallery
5 See also
6 Notes
7 References
[edit]Natural history

The mountains are about 10 miles (16 km) from north to south and east to west, and are the smallest mountain range in the world.[1]
The Sutter Buttes were formed over 1.5 million years ago by a now-extinct volcano. Some geological references suggested that it represents the southernmost of the Cascade Volcanoes [2], but there are significant differences in age and form compared to the other volcanoes in that range. The questions about their origin and connection to other regional volcanic activity are the subject of ongoing research.
The Sutter Buttes contain many flora and fauna species. Wildflowers are represented by numerous taxa; included in these many wildflowers is the Yellow Mariposa Lily, Calochortus luteus.[3]
[edit]Native American lore

The Sutter Buttes figure prominently in the creation stories and other traditions of the indigenous Maidu and Wintun peoples. The Maidu (or Nisenan) lived to the east of the Buttes and the Wintun (Patwin) to the mountain's west. No tribe claimed ownership of the Buttes and there are only season encampments in the mountain. Indians did visit the mountain regularly to gather acorns and other foods or to hunt game. The Buttes were also a center of regional Native American religion. According to anthropologist Alfred Kroeber, the Patwin village where the city of Colusa now stands was the “hotbed” where the Kuksu Cult was established. This religion spread through much of northern California. Ceremonies were performed in earthen dance lodges where spirit impersonators would re-enact ancient mythological events. The Maidu, who lived in their shadow for thousands of years, called them Esto Yamani, which means "the Middle Mountain", the Wintun called the Sutter Buttes Onolai.
[edit]Recent history and access

Public access to the Sutter Buttes is limited. Much of the land is privately held by cattle and sheep ranchers, but a number of naturalists and local organizations, including the Middle Mountain Foundation and the Yuba Historical Society[4], lead hikes through most areas. Since 1929, the State of California had considered purchasing the land for protection and public use.
In 1963, a missile silo complex containing three separate Titan I ICBM missiles was constructed near the base of the Buttes. The site was only active from 1963 to 1965, and it was decommissioned and mostly dismantled in 1965. The site has been host to many vandals and trespassers since the early 1980s to the present.[5] 39°16′32″N 121°49′45″W
In 2003, the California Department of Parks and Recreation purchased a 1,785 acre (7.2 km²) tract in Peace Valley toward the north side of the Buttes with the intent of developing it for public access. Power lines connecting to Path 15 and Path 66 run on the eastern edge of the Sutter Buttes.
[edit]Gallery


A view of the Sutter Buttes on an overcast day

A monument at the base of the mountains indicating that John C. Frémont camped near here

A close up of the inscription on the memorial. The inscription erreoneously uses 1848, rather than the correct 1846 year date.
[edit]See also

Sutter County, California
List of highest points in California by county
[edit]Notes

^ a b Stienstra, Tom (2004-03-18). "State buys parcel in Sutter Buttes But public access to Peace Valley could take years". San Francisco Chronicle (Hearst Corporation): pp. B-1. Retrieved 2009-05-29.
^ Charles A. Wood. 1990
^ C. Michael Hogan. 2009
^ "Introduction (Yuba Historical Society)". Yubahistory.com.
^ "Titan 1". California Cold War Museum & Memorial. Retrieved 2008-12-12.
[edit]References

Stuart Allan (2005). California Road and Recreation Atlas. Benchmark Maps. p. 64. ISBN 0-929591-80-1.
Middle Mountain Foundation - A Sutter Buttes Regional Land Trust Yuba Historical Society [1]
C. Michael Hogan. 2009. Yellow Mariposa Lily: Calochortus luteus, GlobalTwitcher.com, ed. N. Stromberg
Charles A. Wood; Jürgen Kienle, eds. (1990). Volcanoes of North America. Cambridge University Press. pp. 225–226. ISBN 0-521-43811-X.

nepal's diversity

Nepal measures about 800 kilometers (497 mi) along its himalayan axis by 150 to 250 kilometers (93 to 155 mi) across. With 147,181 square kilometers (56,827 sq mi) it slightly outranks Bangladesh or the state of Arkansas. Nepal is landlocked by India on three sides and China's Xizang Autonomous Region (Tibet) to the north. West Bengal's narrow Siliguri Corridor or Chicken's Neck separate Nepal and Bangladesh. To the east are India—and Bhutan. Nepal depends on India for transit facilities and access to the sea—the Bay of Bengal—even for most goods imported from China.

Geographic coordinates: 28°00′N 84°00′E / 28°N 84°E / 28; 84

Contents [hide]
1 The Land
1.1 The Terai Region
1.2 The Hill Region
1.3 The Mountain Region
2 Climate
3 Environment
4 River system
4.1 River Management
5 Area and boundaries
6 Resources and land use
7 Forests
8 Environmental concerns
9 See also
10 References
11 External links


[edit] The Land
For a small country, Nepal has tremendous geographic diversity. It rises from less than 100 metres (328 ft) elevation in the tropical Terai—the northern rim of the Gangetic Plain, beyond the perpetual snow line to some 90 peaks over 7,000 metres (22,966 ft) including Earth's highest 8,848 metres (29,029 ft) Mount Everest or Sagarmatha. In addition to the continuum from tropical warmth to cold comparable to polar regions, average annual precipitation varies from as little as 160 millimetres (6.3 in) in the rainshadow north of the Himalaya to as much as 5,500 millimetres (216.5 in) on windward slopes. [1]

Along a south-to-north transect, Nepal can be divided into three belts: Terai, Hill and Mountain Regions. In the other direction it is divided into three major river systems, from east to west: Koshi, Gandaki/Narayani and Karnali (including the Mahakali/Sarda along the western border), all tributaries of the Ganges. The Ganges-Yarlung Zangbo/Brahmaputra watershed largely coincides with the Nepal-Tibet border, however several Ganges tributaries rise inside Tibet.

[edit] The Terai Region
The Terai or Madhesh region begins at the Indian border and includes the northermost part of the flat, intensively farmed Gangetic Plain called the Outer Terai. This is culturally an extension of northern India with Hindi, Awadhi, Bhojpuri and Maithili spoken more than Nepali, however it was annexed to Nepal by conquest and by treaty with the British.

The Outer Terai ends at the first range of foothills called the Siwaliks or Churia. This range has a densely forested skirt of coarse alluvium called the bhabhar along its base. Below the bhabhar, finer, less permeable sediments force groundwater to the surface in a zone of springs and marshes. In Persian, terai refers to wet or marshy ground. Before the use of DDT it was dangerously infested with malaria. Nepal's rulers used it as a defensive frontier called the char kose jhadi (twelve kilometer forest)

Above the bhabhar belt, the Siwaliks rise to about 700 metres (2,297 ft) with peaks as high as 1,000 metres (3,281 ft), steeper on their southern flanks because of faults known as the Main Frontal Thrust. This range is composed of poorly consolidated, coarse sediments that do not retain water or support soil development so there is virtually no agricultural potential. Hillside vegetation is limited to scrub forest and the area functions as a deserted buffer zone allowing the development of distinctive cultures in valleys and hills further north. In several places beyond the Siwaliks there are dun valleys called Inner Terai with productive soil. Among these are Dang and Deukhuri in western Nepal and the Rapti Valley (Chitwan) in central Nepal. Population in these valleys was historically limited by malaria and mainly limited to the Tharu ethnic group that had developed genetic resistance. Around 1960 DDT came into use to suppress mosquitos and the way was open to settlement from the land-poor hills to the detriment of Tharus.

The Terai ends and the Hills begin at a higher range of foothills called the Mahabharat Range.

[edit] The Hill Region
Situated south of the Mountain Region, the Hill Region (Pahar in Nepali) is mostly between 700 and 4,000 metres (2,297 and 13,123 ft) altitude. This region begins at the Mahabharat Lekh (Lesser Himalaya) where a fault system called the Main Boundary Thrust creates an escarpment 1,000 to 1,500 metres (3,281 to 4,921 ft) high, to a crest between 1,500 and 2,700 metres (4,921 and 8,858 ft). These steep southern slopes are nearly uninhabited, thus an effective buffer between languages and culture in the Terai and Hill regions. Northern slopes are gentler and moderately well populated.

North of this range, Nepali-speaking Hindus and Newar merchants who also speak Newari densely populate valleys suited to rice cultivation as high as 2,000 metres (6,562 ft). The increasingly urbanized Kathmandu and Pokhara valleys fall within this region. Indigenous janajati ethnic groups—natively speaking highly localized Tibeto-Burman languages and dialects—populate hillsides up to about 3,000 metres (9,843 ft). This group includes Magar and Kham Magar west of Pokhara, Gurung south of the Annapurnas, Tamang around the periphery of Kathmandu Valley and Rai and Limbu further east. Beyond microclimates suited to rice cultivation and proximity to water for irrigation, these cultivate maize, millet, barley and potatoes as staple crops. Temperate and subtropical fruits are grown as cash crops. Marijuana is grown and processed into Charas (hashish), but less than was produced before international pressure persuaded the government to outlaw it in the 1970s. There is increasing reliance on animal husbandry with elevation, using land above 3,000 metres (9,843 ft) for summer grazing and moving herds to lower elevations in winter. Outside the rice-growing lower valleys, hill populations suffer chronic food deficits. Many menfolk find employment in the Terai, in India or overseas to earn cash for imported grain. The Hill region ends dramatically where the main Himalayan Range abruptly rises thousands of meters.

[edit] The Mountain Region

Perspective view of the Himalaya and Mount Everest as seen from space looking south-south-east from over the Tibetan Plateau. (annotated version)The Mountain Region or Parbat abruptly rises into the zone of perpetual snow along the Main Central Thust fault zone. South of this fault system, "hills" do not greatly exceed treeline at about 3,500 metres (11,483 ft). North of it the Himalayas rise as a virtual wall beyond the snowline at 5,000 to 5,500 metres (16,404 to 18,045 ft) to some 90 peaks over 7,000 metres (22,966 ft) and eight exceeding 8,000 metres (26,247 ft) including Mount Everest at 8,848 metres (29,029 ft) and Kanchenjunga at 8,598 metres (28,209 ft). Unlike the Mahabharats, the Himalaya are not continuous across Nepal. Instead there are some 20 subranges including the Kanchenjunga massif, Kumbu around Mt. Everest. Langtang north of Kathmandu, Annapurna north of Pokhara and Dhaulagiri further west, then Kanjiroba north of Jumla.

Alpine, often semi-arid valleys—including Humla, Jumla, Dolpo, Mustang, Manang and Khumbu-- cut between himalayan subranges or lie north of them. They are lightly populated by people with Tibetan affinities called Bhotiya or Bhutia including the famous Sherpas in Kumbu valley near Mount Everest. Permanent villages are found as high as 4,500 metres (14,764 ft) with summer encampments even higher. These peoples traditionally grazed yaks, grew cold-tolerant crops such as potatoes, barley and millet, and traded across the mountains, e.g. Tibetan salt for rice from lowlands in Nepal and India. Since the 1950s they have also found work as high altitude porters, guides, cooks and other accessories to tourism and alpinism.

Bhutiya language and culture extend north into Tibet proper, with the international border following the Himalayan crest in eastern Nepal. In central and western Nepal the border mostly follows the watershed between the Ganges and Yarlung Zangbo (Brahmaputra) basins along (about 6,000 metres (19,685 ft)) ranges tens of kilometers north of the highest peaks.

[edit] Climate

Satellite image of Nepal in October 2002Nepal has tremendous variation in climate. Its latitude is about the same as that of Florida so Terai land up to 500 meters (1,640 ft) has a fully tropical climate, with a subtropical zone extending up to 1,200 meters (3,937 ft) which is the lower limit of frost in winter. Warm temperate climates prevail from 1,200 to 2,400 meters (3,937 to 7,874 ft) where snow occasionally falls. Then there is a cold zone to 3,600 meters (11,811 ft) (treeline), a subarctic or alpine zone to 4,400 meters (14,436 ft) and fully arctic climate above that. Precipitation generally decreases from east to west with increasing distance from the Bay of Bengal, source of the summer monsoon. Eastern Nepal gets about 2,500 mm (98.4 in) annually; the Kathmandu area about 1,400 mm (55.1 in) and western Nepal about 1,000 mm (39.4 in). This pattern is modified by adabiatic effects as rising air masses cool and drop their moisture content on windward slopes, then warm up as they descend so relative humidity drops. Annual precipitation reaches 5,500 mm (216.5 in) on windward slopes in the Annapurna Himalaya beyond a relatively low stretch of the Mahabharat Range. In rainshadows beyond the high mountains, annual precipitation drops as low as 160 mm (6.3 in), creating a cold semi-desert.

Furthermore the year is divided into a wet season from June to September—as summer warmth over Inner Asia creates a low pressure zone that draws in air from the Indian Ocean—and a dry season from October to June as cold temperatures in the vast interior creates a high pressure zone causing dry air to flow outward. April and May are months of intense water stress when cumulative effects of the long dry season are exacerbated by temperatures rising over 40 °C (104 °F). Seasonal drought intensifies in the Siwaliks hills consisting of poorly-consolidated, coarse, highly permeable sediments that do not retain water, so hillsides are covered with tropical scrub forest that is extremely drought-tolerant. In fact outside marsh and riparian zones, most of Nepal's native vegetation is adapted to withstand drought, although less so at higher elevations where cooler temperatures mean less water stress.

The monsoon is preceded by a buildup of thunderstorm activity in the hills that helps farmers irrigate rice seedbeds. Sustained rain on average arrives in early June as rising temperatures over Inner Asia creates a low pressure zone that draws in air from the Indian Ocean, but this can vary up to a month. Significant failure of monsoon rains historically meant drought and famine while above-normal rains still cause flooding and landslides with losses in human lives, farmland and buildings. The monsoon also complicates transportation with roads and trails washing out while unpaved roads and airstrips may become unusable and cloud cover reduces safety margins for aviation. Rains diminish in September and generally end by mid-October, ushering in generally cool, clear, and dry weather, as well as the most relaxed and jovial period in Nepal. By this time, the harvest is completed and people are in a festive mood. The two biggest and most important Hindu festivals-- Dashain and Tihar (Dipawali)--arrive during this period, about one month apart. The postmonsoon season lasts until about December.

After the postmonsoon comes the winter monsoon, a strong northeasterly flow marked by occasional, short rainfalls in the lowlands and plains and snowfalls in the high-altitude areas. Precipitation varies from year to year but increases markedly with elevation. Adequate snowfall in the Himalaya is important for sufficient spring and summer meltwater for irrigation in the lower hills and valleys. At lower elevations, winter rainfall is needed for the success of winter crops such as wheat, barley and vegetables. In this season the Himalaya function as a barrier to cold air masses from Inner Asia, so southern Nepal and northern India have warmer winters than would otherwise be the case. April and May are dry and hot, especially below 1,200 meters (3,937 ft) where afternoon temperatures may exceed 40 °C (104 °F).

[edit] Environment
The dramatic changes in elevation along this transect result in a variety of biomes, from tropical savannas along the Indian border, to subtropical broadleaf and coniferous forests in the hills, to temperate broadleaf and coniferous forests on the slopes of the Himalaya, to montane grasslands and shrublands, and finally rock and ice at the highest elevations.

This corresponds to the Terai-Duar savanna and grasslands ecoregion.

Subtropical forests dominate the lower elevations of the Hill Region. They form a mosaic running east-west across Nepal, with Himalayan subtropical broadleaf forests between 500 and 1,000 metres (1,640 and 3,281 ft) and Himalayan subtropical pine forests between 1,000 and 2,000 metres (3,281 and 6,562 ft). At higher elevations, to 3,000 metres (9,843 ft), are found temperate broadleaf forests: eastern Himalayan broadleaf forests to the east of the Gandaki River and western Himalayan broadleaf forests to the west.

The native forests of the Mountain Region change from east to west as precipitation decreases. They can be broadly classified by their relation to the Gandaki River. From 3,000 to 4,000 metres (9,843 to 13,123 ft) are the eastern and western Himalayan subalpine conifer forests. To 5,500 metres (18,045 ft) are the eastern and western Himalayan alpine shrub and meadows.

[edit] River system
Nepal has three categories of rivers. The largest river systems—from east to west Koshi, Gandaki/Narayani, Karnali/Goghra and Mahakali -- originate in or beyond the high Himalaya and maintain substantial flows from glacial melt through the hot, droughty spring before the summer monsoon. These largest rivers cross the mountains in deep gorges before emerging onto the plains where they have deposited megafans exceeding 10,000 km2 (3,861 sq mi) area.

the Koshi is also called Sapta Koshi for its seven Himalayan tributaries: Indrawati, Bhote Koshi, Tama Koshi, Dudh Koshi, Liku, Arun, and Tamor. The Arun rises about 150 kilometers inside Tibet.

The Gandaki/Narayani also has seven Himalayan tributaries: Daraudi, Seti Gandaki, Madi, Kali, Marsyandi, Budhi, and Trisuli also called Sapta Gandaki. The Kali Gandaki flows between the 8,000-meter (26,247 ft) Dhaulagiri and Annapurna ranges in the world's deepest valley. After the seven upper tributaries have joined, the river becomes the Narayani inside Nepal, however it is called the Gandak in India.

The Karnali drains western Nepal, with the Bheri and Seti as major tributaries. The upper Karnali rises inside Tibet near sacred Lake Manasarovar and Mount Kailash. The area around these features is the hydrographic nexus of South Asia by containing the sources of the Indus, Sutlej, Ganges tributary Karnali and Yarlung Zangbo/Brahmaputra. It is the center of the universe according to traditional cosmography. The Mahakali or Kali along the Nepal-India border on the west joins the Karnali in India, where the river is known as Goghra or Ghaghara.

Second category rivers rise in the Middle Hills and Mahabharat Range, from east to west the Mechi, Kankai and Kamala south of the Kosi; the Bagmati that drains Kathmandu Valley between the Kosi and Gandaki systems, then the West Rapti and the Babai between the Gandaki and Karnali systems. Without glacial sources, annual flow regimes are more variable although limited flow persists through the dry season.

Third category rivers rise in the outermost Siwalik foothills and are mostly seasonal.

None of these river systems support significant commercial navigation. Instead, deep gorges create obstacles to establishing transport and communication networks and de-fragmenting the economy. Foot-trails are still primary transportation routes in many hill districts.


Nepal's towns, villages, rivers and peaks[edit] River Management
All three categories are capable of causing serious floods, for example the West Rapti in the second category is called Gorakhpur's Sorrow for its history of urban flooding. Koshi River in the first category caused a major flood in August 2008 in Bihar state, India after breaking through a poorly-maintained embankment just inside Nepal.

Since uplift and erosion are more or less in equilibrium in the Himalaya, rapid uplift is balanced by annual increments of cubic kilometers of sediments washing down from the mountains, then on the plains settling out of suspension on vast alluvial fans or inland deltas over which rivers meander and change course at least every few decades, causing some experts to question whether manmade embankments can contain the problem of flooding. Traditional Mithila culture along the lower Koshi in Nepal and Bihar celebrated the river as the giver of life for its fertile alluvial soil, yet also the taker of life through its catastrophic floods.

Another approach would be to build large dams—in gorges crossing the Mahabharat Range or further upstream—with storage capacities measured in cubic kilometers to capture high flows during the monsoon when there is usually enough rainfall on the plains if not flooding, then releasing water for hydroelectric generation and irrigation especially during the hot and dry pre-monsoon "summer". Nepal would appear to have unusual potential given its average annual 150 cm. of precipitation and thousands of meters of relief between mountains and plains, but there has only been limited development of this potential for example on the Kali Gandaki north of Tansen.

Building dams in Nepal is controversial for several reasons. First, the region is seismically active. Dam failures caused by earthquakes could cause tremendous death and destruction downstream, particularly on the densely populated Gangetic Plain. Second, global warming has led to the formation of glacial lakes dammed by unstable moraines. Sudden failures of these moraines could lead to cascading failures of manmade structures downstream. Third, sedimentation rates in the Himalaya are extremely high, leading to rapid loss of storage capacity as sediments accumulate behind dams. Fourth, there are complicated questions of cross-border equity in how India and Nepal would share costs and benefits that have proven difficult to resolve in the context of frequent acrimony between the two countries.

[edit] Area and boundaries
Area
Total: 147,181 km²
Land: 143,181 km²
Water: 4,000 km²
Area - comparative
Roughly 1⅔ Tasmania's size
Roughly twice New Brunswick's size
Slightly less than twice Scotland's size
Slightly larger than Arkansas
Land boundaries
Total: 2,926 km
Border countries: China 1,236 km, India 1,690 km
Coastline
0 km (landlocked)
Maritime claims
None (landlocked)
Elevation extremes
Lowest point: Kanchan Kalan 70 m
Highest point: Sagarmatha (Mount Everest) 8,848 m
[edit] Resources and land use
Natural resources
Quartz, water, timber, hydropower, scenic beauty, small deposits of lignite, copper, cobalt, iron ore
Land use
Arable land: 21.68%
Permanent crops: 0.64%
Other: 77.68% (2001)
Irrigated land
11,350 km² (1998 est.)
[edit] Forests
25.4% of Nepal's land area, or about 36,360 km2 (14,039 sq mi) is covered with forest according to FAO figures from 2005. FAO estimates that around 9.6% of Nepal's forest cover consists of primary forest which is relatively intact. About 12.1% Nepal's forest is classified as protected while about 21.4% is conserved according to FAO. About 5.1% Nepal's forests are classified as production forest. Between 2000-2005, Nepal lost about 2,640 km2 (1,019 sq mi) of forest. Nepal's 2000-2005 total deforestation rate was about 1.4% per year meaning it lost an average of 530 km2 (205 sq mi) of forest annually. Nepal's total deforestation rate from 1990-2000 was 920 km2 (355 sq mi) or 2.1% per year. The 2000-2005 true deforestation rate in Nepal, defined as the loss of primary forest, is -0.4% or 70 km2 (27 sq mi) per year.

Deforestation is driven by multiple processes. In the hills, conversion of forests to agricultural land—even on steep hillsides via terracing—is historically important, but has lessened in recent decades due to a shortage of remaining suitable terrain in the hills while mosquito suppression having opened formerly malarial land for settlement in the Terai. As a result, forest land in the Terai is being cleared by settlers.

In the hills, greater contemporary impacts involve degradation of forests rather than outright clearing. Degradation is caused by harvesting firewood, and to a lesser extent wood for traditional architecture. These harvests are often carried to unsustainable levels. Trees are also severely damaged by intensive harvesting of leaves as fodder, especially in the driest months preceding the summer monsoon. Households typically keep at least one cow or buffalo for milk production and may also keep oxen for agricultural labor. In addition goats are herded as the main source of meat that is culturally acceptable to upper-caste Hindus.

FAO Forestry Department Nepal Country Page
Ministry of Forests and Soil Conservation Nepal
Forestry Information in Nepal
[edit] Environmental concerns
Natural hazards
Severe thunderstorms, flooding, landslides, drought, and famine depending on the timing, intensity, and duration of the summer monsoons
Environment - current issues
Deforestation (overuse of wood for fuel and lack of alternatives); contaminated water (with human and animal wastes, agricultural runoff, and industrial effluents); wildlife conservation; vehicular emissions; High arsenic and microbiological levels in groundwater
Environment - international agreements
Party to: Biodiversity, Climate Change, Desertification, Endangered Species, Hazardous Wastes, Law of the Sea, Nuclear Test Ban, Ozone Layer Protection, Tropical Timber 83, Tropical Timber 94, Wetlands
Signed, but not ratified: Marine Life Conservation
Existing and proposed dams, barrages and canals for flood control, irrigation and hydroelectric generation
Geography - note
Landlocked; strategic location between China and India; contains eight of world's 10 highest peaks
[edit] See also
Nepal
List of mountains in Nepal
[edit] References
^ Dahal
This article incorporates public domain material from websites or documents of the Library of Congress Country Studies.
This article incorporates public domain material from the CIA World Factbook document "2005 edition".



[edit] External links
Nepal Encyclopedia Geopolitical category
[show]v • d • eGeography of South Asia

Mountains and Plateaus Himalayas · Western Ghats · Eastern Ghats · Aravalli Range · The Nilgiris · Vindhya Range · Satpura Range · Garo Hills · Shivalik Hills · Khasi Hills · Annamalai Hills · Cardamom Hills · Sulaiman Mountains · Toba Kakar Range · Karakoram · Hindu Kush · Chittagong Hill Tracts · Deccan Plateau · Thar Desert · Makran · Chota Nagpur · Naga Hills · Mysore Plateau · Ladakh Plateau

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Categories: Geography of Nepal
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koshi (sorrow of bihar)

This article may require copy editing for grammar, style, cohesion, tone or spelling. You can assist by editing it. (August 2008)
Koshi River
River
Countries China, Nepal, India
State Bihar

Cities Biratnagar, Purnia, Katihar

The Kosi River -- called Koshi in Nepal (Nepali: कोशी नदी) as well as Saptakoshi for its seven Himalayan tributaries -- is a transboundary river between Nepal and India, one of the largest tributaries of the Ganges.

The river, along with its tributaries, drains a total area of 69,300 km2 (26,800 sq mi) up to its confluence with the Ganges in India (29,400 km2/11,400 sq mi in China, 30,700 km2/11,900 sq mi in Nepal and 9,200 km2/3,600 sq mi in India). The watershed also includes part of Tibet, including the Mount Everest region, and the eastern third of Nepal.

The river basin is surrounded by the ridges separating it from the Yarlung Zangbo River in the north, the Gandaki in the west, the Mahananda in the east, and by the Ganges in the south. The river is joined by major tributaries in the Mahabharat Range approximately 48 km (30 mi) north of the Indo-Nepal border. Below the outermost foothills (Siwaliks) the river has built up a megafan some 15,000 sq. km in extent, breaking into more than twelve distinct channels with shifting courses due to flooding.[1][2] Kamlā, Bāghmati (Kareh) and Budhi Gandak are major tributaries of Koshi in India, besides minor tributaries like Bhutahi Balān.[3][4] Over the last 250 years, the Kosi River has shifted its course over 120 kilometres (75 mi) from east to west.[5] and the unstable nature of the river is attributed to the heavy silt which it carries during the monsoon season. Flooding in India has extreme effects. India is second in the world after Bangladesh in deaths due to flooding, accounting for one fifth of global flooding deaths. The Kosi River (The Sorrow of Bihar) is one of two major tributaries, the other river being Gandak, draining the plains of north Bihar, the most flood-prone area of India[6]
Kanchenjunga. It has seven major tributaries: the Sun Koshi, the Tama Koshi or Tamba Koshi, the Dudh Koshi, the Indravati, the Likhu River, the Arun and the Tamur. The Dudh Koshi joins the Sun Koshi at the Nepalese village of Harkapur. At Triveni Sun the Koshi is joined by the Arun and the Tamar, after which the river is called the Sapta Koshi. At Barāhkṣetra in Nepal, it descends from the mountains and it is then called simply the Koshi. These tributaries encircle Mt Everest from all sides and are fed by the world's highest glaciers. Further down the Triveni, the river cuts a deep gorge across the lesser Himalayan range of Mahabharat Lekh in a length of 10 km (6.2 mi) and debouches into the plains near Chatra. After flowing for another 58 km (36 mi), it enters the north Bihar plains near Bhimnagar and after another 260 km (160 mi), flows into the Ganges near Kursela(1). The river travels a distance of 729 km (453 mi) from its source to the confluence with the Ganges.

The Kosi river fan located in the northern part of India (in northeast Bihar and eastern Mithila) is one of the largest alluvial cones built by any river in the world. This 180 km (110 mi)-long and 150 km (93 mi)-wide alluvial cone shows evidence of lateral channel shifting exceeding 120 km (75 mi) during the past 250 years through more than 12 distinct channels. The river, which used to flow near Purnea in the 18th century, now flows west of Saharsa (1). The Kosi alluvial cone and its adjoining area have been studied in detail by remote sensing techniques. The data have been integrated with the available geological and geophysical information to decipher the causes responsible for the lateral shift of such a high-magnitude fan. A satellite image shows the old palaeo-channels of the Koshi river with its former (before 1731) confluence with the Mahananda River north of Lava.[7]

mahendra cave nepal

Mahendra Cave is one of the most prominent Tourist Attractions in Pokhara. Pokhara is a major city in Nepal that is located between the Greater Himalaya and Mahabharata Range. This enthralling city of Pokhara is set amidst the tranquil and serene valley, which is the gateway to the world of excitement, natural beauty and adventure. The Mahendra Cave is one site that adds to the charm of the city. You can site the Mahendra Cave at Batulechaur. It will take you just about ten minutes drive from the central market place of the city. As the name of the cave suggests, it has been named after the Late King Mahendra Bir Bikram Shah Dev. Over the years, this has become one of the most visited tourist spots in Pokhara.

It is interesting to note that Mahendra Cave in Pokhara is a natural tunnel that is illuminated artificially. It is recommended to take a torch or light with you for your safety inside the cave. This cave is internationally famous for its rich rock varieties. These rocks are said to sparkle when lights strike on it. Here, you can find big boulders of rocks that are used to block several opening of the caves. Several stalactites in the cave create an eerie effect among the travelers.

caves

A cave or cavern is a natural underground space large enough for a human to enter. Some people suggest that the term cave should only apply to cavities that have some part that does not receive daylight; however, in popular usage, the term includes smaller spaces like sea caves, rock shelters, and grottos.

Speleology is the science of exploration and study of all aspects of caves and the environment which surrounds the caves. Exploring a cave for recreation or science may be called caving, potholing, or, in Canada and the United States, spelunking (see Caving).

[edit] Geographic distribution
Caves are found throughout the world, but only a portion of them have been explored and documented by cavers. The distribution of documented cave systems is widely skewed toward countries where caving has been popular for many years (such as France, Italy, Australia, the UK, the United States, etc.). As a result, explored caves are found widely in Europe, Asia, North America, and Oceania but are sparse in South America, Africa, and Antarctica. This is a great generalization, as large expanses of North America and Asia contain no documented caves, whereas areas such as the Madagascar dry deciduous forests and parts of Brazil contain many documented caves. As the world’s expanses of soluble bedrock are researched by cavers, the distribution of documented caves is likely to shift. For example, China, despite containing around half the world's exposed limestone - more than 1,000,000 square kilometers (390,000 sq mi) - has relatively few documented caves
[edit] Primary cave

Exploring a lava tube in Hawaii.Some caves are formed at the same time as the surrounding rock. These are sometimes called primary caves.

Lava tubes are formed through volcanic activity and are the most common 'primary' caves. The lava flows downhill and the surface cools and solidifies. The hotter lava continues to flow under that crust, and if most of the liquid lava beneath the crust flows out, a hollow tube remains, thus forming a cavity. Examples of such caves can be found on the Canary Islands, Hawaii, and many other places. Kazumura Cave near Hilo is a remarkably long and deep lava tube; it is 65.6 kilometers (40.8 mi) long.

Lava caves, include but are not limited to lava tubes. Other caves formed through volcanic activity include rift caves, lava mold caves, open vertical volcanic conduits, and inflationary caves.

[edit] Sea cave or littoral cave
Main article: Sea cave

Painted Cave, a large sea cave, Santa Cruz Island, CaliforniaSea caves are found along coasts around the world. A special case is littoral caves, which are formed by wave action in zones of weakness in sea cliffs. Often these weaknesses are faults, but they may also be dykes or bedding-plane contacts. Some wave-cut caves are now above sea level because of later uplift. Elsewhere, in places such as Thailand's Phang Nga Bay, solutional caves have been flooded by the sea and are now subject to littoral erosion. Sea caves are generally around 5 meters (16 ft) to 50 meters (160 ft) in length but may exceed 300 meters (980 ft).

[edit] Corrasional cave or erosional cave
Corrasional or erosional caves are those that form entirely by erosion by flowing streams carrying rocks and other sediments. These can form in any type of rock, including hard rocks such as granite. Generally there must be some zone of weakness to guide the water, such as a fault or joint. A subtype of the erosional cave is the wind or aeolian cave, carved by wind-born sediments. Note that many caves formed initially by solutional processes often undergo a subsequent phase of erosional or vadose enlargement where active streams or rivers pass through them.

[edit] Glacier cave
Main article: Glacier cave

Glacier cave in Big Four Glacier, Big Four Mountain, Washington, ca. 1920.Glacier caves occur in ice and under glaciers and are formed by melting. They are also influenced by the very slow flow of the ice, which tends to close the caves again. (These are sometimes called ice caves, though this term is properly reserved for caves that contain year-round ice formations).

[edit] Fracture cave
Fracture caves are formed when layers of more soluble minerals, such as gypsum, dissolve out from between layers of less soluble rock. These rocks fracture and collapse in blocks of stone.

[edit] Talus cave
Talus caves are the openings between rocks that have fallen down into a pile, often at the bases of cliffs (called "talus").

[edit] Anchihaline cave
Main article: Anchihaline cave
Anchihaline caves are caves, usually coastal, containing a mixture of freshwater and saline water (usually sea water). They occur in many parts of the world, and often contain highly specialized and endemic faunas.

deeepest valley

Owens Valley is the arid valley of the Owens River in eastern California in the United States, to the east of the Sierra Nevada. The mountains on either side (including Mount Whitney) reach above 14,000 feet (4,300 m) in elevation, while the floor of the Owens Valley is at 4,000 feet (1,200 m), making the valley one of the deepest in the United States.[2] The Sierra Nevada casts the valley in a rain shadow, which makes Owens Valley "the land of little rain."[3] The bed of Owens Lake, now a dry alkali flat, sits on the southern end of the valley.

The valley provides water to the Los Angeles Aqueduct, the source of one-third of the water for Los Angeles, and is infamous as the scene of one of the fiercest and longest running episodes of the California Water Wars. These episodes inspired aspects of the film Chinatown.

Towns in the Owens Valley include Bishop, Lone Pine, Independence and Big Pine. The major road in the valley is U.S. Route 395.
Beginning about 3 million years ago, the Sierra Nevada Fault and the White Mountains Fault systems became active with repeated episodes of slip earthquakes gradually producing the impressive relief of the eastern Sierra Nevada and White Mountain escarpments that bound the northern Owens Valley-Mono Basin region.

Owens Valley is a graben; a downdropped block of land between two vertical faults. Owens Valley is the westernmost graben in the Basin and Range Province. It is also part of a trough which extends from Oregon to Death Valley called the Walker Lane.[4]

The western flank of much of the valley has large moraines coming off the Sierra Nevada. These unsorted piles of rock, boulders, and dust were bulldozed to where they are by glaciers during the last ice age. An excellent example of a moraine is on State Route 168 as it climbs into Buttermilk Country.[4]

This graben was formed by a long series of earthquakes, such as the 1872 Lone Pine earthquake, that have moved the graben down and helped move the Sierra Nevada up. The graben is in fact much larger than the depth of the valley suggests; gravity studies suggest that 10,000 feet (3,048.0 m) of sedimentary rock mostly fills the graben and that a very steep escarpment is buried under the western length of the valley. The topmost part of this escarpment is exposed at Alabama Hills.

See also: Inyo and Mono Craters. Smaller versions of the Devils Postpile, can be found, for example, by Little Lake.

death valley

Death Valley National Park is a National Park located east of the Sierra Nevada in the arid Great Basin of the United States. Parts of the park are in southern Inyo County and northern San Bernardino County in Eastern California, with a small extension into southwestern Nye County and extreme southern Esmeralda County in Nevada. In addition, there is an exclave (Devil's Hole) in southern Nye County. The park covers 5,262 square miles (13,630 km2), encompassing Saline Valley, a large part of Panamint Valley, almost all of Death Valley, and parts of several mountain ranges.[1] Death Valley National Monument was declared a U.S. National Monument in 1933, placing the area under federal protection. In 1994, the monument was redesignated a national park, as well as being substantially expanded to include Saline and Eureka valleys.[1]

It is the hottest and driest of the national parks in the United States. The second-lowest point in the Western Hemisphere is in Badwater Basin, which is 282 feet (86 m) below sea level. The park is home to many species of plants and animals that have adapted to this harsh desert environment. Some examples include creosote bush, Bighorn Sheep, Coyote, and the Death Valley Pupfish, a survivor of much wetter times. Approximately 95% of the park is designated as wilderness.[2] Its wilderness area covers 4,774 square miles (12,360 km2), making it the largest in the Lower 48 states, and the sixth largest in the United States overall. Death Valley National Park is visited annually by more than 770,000 visitors who come to see its diverse geologic features, desert wildlife, historic sites, scenery, and clear night skies.[3]

Mining was the primary activity in the area before it was protected. The first documented non-Native Americans to enter Death Valley did so in the winter of 1849, thinking they would save time by taking a shortcut to the gold fields of California. They were stuck for weeks and in the process gave the valley its name, even though only one of their group died there. Several short-lived boom towns sprang up during the late 19th and early 20th centuries to exploit minor local bonanzas of gold. The only long-term profitable ore to be mined, however, was borax, a mineral used to make soap and an important industrial compound. Today, borax is an essential component of high-temperature resistant boro-silicate glass products, for example Pyrex cookware. Twenty-mule teams were used to transport ore out of the valley; helping to make it famous and the subject of books, radio programs, television series, and movies.

The natural environment of the area has been shaped largely by its geology. The valley itself is actually a graben. The oldest rocks are extensively metamorphosed and at least 1.7 billion years old.[4] Ancient warm, shallow seas deposited marine sediments until rifting opened the Pacific Ocean. Additional sedimentation occurred until a subduction zone formed off the coast. This uplifted the region out of the sea and created a line of volcanoes. Later the crust started to pull apart, creating the current Basin and Range landform. Valleys filled with sediment and, during the wet times of glacial periods, with lakes, such as Lake Manly.

The park has a diverse and complex geologic history. Since its formation, the area that comprises the park has experienced at least four major periods of extensive volcanism, three or four periods of major sedimentation, and several intervals of major tectonic deformation where the crust has been reshaped. Two periods of glaciation (a series of ice ages) have also had effects on the area, although no glaciers ever existed in the ranges now in the park.

[edit] Basement and Pahrump Group
Little is known about the history of the oldest exposed rocks in the area due to extensive metamorphism (alteration of rock by heat and pressure). Radiometric dating gives an age of 1,700 million years for the metamorphism (during the Proterozoic: See bottom of the geologic timeline).[4] About 1,400 million years ago a mass of granite now in the Panamint Range intruded this complex.[24] Uplift later exposed these rocks to nearly 500 million years of erosion.[24]

On these basement rocks was deposited the sedimentary formation of the Pahrump Group. This occurred after uplift-associated erosion removed whatever rocks covered the Proterozoic-aged rocks. The Pahrump is composed of arkose conglomerate (quartz clasts in a concrete-like matrix) and mud stone in its lower part, followed by dolomite from carbonate banks topped by algal mats in stromatolites, and finished with basin-filling sediment derived from the above, including possible glacial till from the hypothesized Snowball Earth glaciation.[25] The very youngest rocks in the Pahrump Group are from basaltic lava flows.