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The Himalayas (also Himalaya, Sanskrit: हिमालय, IPA pronunciation: , ) are a mountain range in Asia, separating the Indian subcontinent from the Tibetan Plateau. By extension, it is also the name of the massive mountain system which includes the Himalaya proper, the Karakoram, the Hindu Kush, and a host of minor ranges extending from the Pamir Knot. The name is from Sanskrit himālaya, a tatpurusa compound meaning "the abode of snow" (from hima "snow", and ālaya "abode"; see also Himavat).

Together, the Himalaya mountain system is the planet's highest and home to the world's highest peaks: the Eight-thousanders, including Mount Everest. To comprehend the enormous scale of Himalayan peaks, consider that Aconcagua, in the Andes, at 6,962 m, is the highest peak outside the Himalaya, while the Himalayan system has over 100 separate mountains exceeding 7,200 meters.

The Himalayas stretch across six nations: Bhutan, China, India, Nepal, Pakistan and Afghanistan. It is the source of three of the world's major river systems, the Indus Basin, the Ganga-Brahmaputra Basin and the Yangtze Basin. An estimated 750 million people live in the watershed area of the Himalayan rivers, which also includes Bangladesh.

Ecology

The flora and fauna of the Himalayas varies with climate, rainfall, altitude, and soils. The climate ranges from tropical at the base of the mountains to permanent ice and snow at the highest elevations. The amount of yearly rainfall increases from west to east along the front of the range. This diversity of climate, altitude, rainfall and soil conditions generates a variety of distinct plant and animal communities, or ecoregions.

Lowland forests

On the Indo-Gangetic plain at the base of the mountains, an alluvial plain drained by the Indus and Ganges-Brahmaputra river systems, vegetation varies from west to east with rainfall. The xeric Northwestern thorn scrub forests occupy the plains of Pakistan and the Indian Punjab. Further east lie the Upper Gangetic plains moist deciduous forests of Uttar Pradesh and Lower Gangetic plains moist deciduous forests of Bihar and West Bengal. These are monsoon forests, with drought-deciduous trees that lose their leaves during the dry season. The moister Brahmaputra Valley semi-evergreen forests occupy the plains of Assam.

The Terai belt

Above the alluvial plain lies the Terai strip, a seasonally marshy zone of sand and clay soils. The Terai has higher rainfall than the plains, and the downward-rushing rivers of the Himalaya slow down and spread out in the flatter Terai zone, depositing fertile silt during the monsoon season and receding in the dry season. The Terai has a high water table, and the central part of the Terai belt is occupied by the Terai-Duar savanna and grasslands, a mosaic of grasslands, savannas, deciduous and evergreen forests that includes some of the world's tallest grasslands. The grasslands of the Terai belt are home to the Indian Rhinoceros (Rhinoceros unicornis).

The Bhabhar belt

Montane forests

At the middle elevations of the range, the subtropical forests yield to a belt of temperate broadleaf and mixed forests, with the Western Himalayan broadleaf forests at the western end of the range, and the Eastern Himalayan broadleaf forests in Assam and Arunachal Pradesh. Above the broadleaf forests are the Western and Eastern Himalayan subalpine conifer forests.

Alpine shrub and grasslands

Above the tree line are the Northwestern, Western, and Eastern Himalayan alpine shrub and meadows, which yield to tundra in the higher Himalayan range. The alpine meadows are the summer habitat of the endangered Snow Leopard (Uncia uncia). The highest reaches of the range are above the permanent snow line.

Origins and growth

The Himalayas are among the youngest mountain ranges on the planet. According to the modern theory of plate tectonics, their formation is a result of a continental collision or orogeny along the convergent boundary between the Indo-Australian Plate and the Eurasian Plate. The collision began in the Upper Cretaceous period about 70 million years ago, when the north-moving Indo-Australian Plate, moving at about 15 cm/year, collided with the Eurasian Plate. By about 50 million years ago this fast moving Indo-Australian plate had completely closed the Tethys Ocean, whose existence has been determined by sedimentary rocks settled on the ocean floor and the volcanoes that fringed its edges. Since these sediments were light, they crumpled into mountain ranges rather than sinking to the floor. The Indo-Australian plate continues to be driven horizontally below the Tibetan plateau, which forces the plateau to move upwards. The Arakan Yoma highlands in Myanmar and the Andaman and Nicobar Islands in the Bay of Bengal were also formed as a result of this collision.

The Indo-Australian plate is still moving at 67 mm/year, and over the next 10 million years it will travel about 1,500 km into Asia. About 20 mm/year of the India-Asia convergence is absorbed by thrusting along the Himalaya southern front. This leads to the Himalayas rising by about 5 mm/year, making them geologically active. The movement of the Indian plate into the Asian plate also makes this region seismically active, leading to earthquakes from time to time.

Glaciers and river systems

The Himalayan range encompasses a very large number of glaciers, notable among which is the Siachen Glacier, the largest in the world outside the polar region. Some of the other more famous glaciers include the Gangotri and Yamunotri (Uttarakhand), Nubra, Biafo and Baltoro (Karakoram region), Zemu (Sikkim) and Khumbu glaciers (Mount Everest region).

The higher regions of the Himalayas are snowbound throughout the year in spite of their proximity to the tropics, and they form the sources for several large perennial rivers, most of which combine into two large river systems:

• The western rivers combine into the Indus Basin, of which the Indus River is the largest. The Indus begins in Tibet at the confluence of Sengge and Gar rivers and flows southwest through Pakistan to the Arabian Sea. It is fed by the Jhelum, the Chenab, the Ravi, the Beas, and the Sutlej rivers, among others.
• Most of the other Himalayan rivers drain the Ganga-Brahmaputra Basin. Its two main rivers are the Ganges and the Brahmaputra. The Ganga originates as the Bhagirathi from the Gangotri glacier and flows southeast through the plains of northern India, fed by the Alaknanda and the Yamuna among other tributaries. The Brahmaputra originates as the Tsangpo in western Tibet, and flows east through Tibet and west through the plains of Assam. The Ganga and the Brahmaputra meet in Bangladesh, and drain into the Bay of Bengal through the world's largest river delta.

The eastern-most Himalayan rivers feed the Ayeyarwady River, which originates in eastern Tibet and flows south through Myanmar to drain into the Andaman Sea.

The Salween, Mekong, the Yangtze and the Huang He (Yellow River) all originate from parts of the Tibetan plateau that are geologically distinct from the Himalaya mountains, and are therefore not considered true Himalayan rivers. Some geologists refer to all the rivers collectively as the circum-Himalayan rivers.

In recent years scientists have monitored a notable increase in the rate of glacier retreat across the region as a result of global climate change. Although the effect of this won't be known for many years it potentially could mean disaster for the hundreds of thousands of people that rely on the glaciers to feed the rivers of northern India during the dry seasons.

Lakes

The Himalaya region is dotted with hundreds of lakes. Most lakes are found at altitudes of less than 5,000 m, with the size of the lakes diminishing with altitude. The largest lake is the Pangong Tso, which is spread across the border between India and Tibet. It is situated at an altitude of 4,600 m, and is 8 km wide and nearly 134 km long. A notable high (but not the highest) lake is the Gurudogmar in North Sikkim at an altitude of 5,148 m (16,890 feet) (altitude source: SRTM). Other major lakes include the Tsongmo lake, near the Indo-China border in Sikkim and Tilicho lake, a large lake in an area that was closed to outsiders until recently.

The mountain lakes are known to geographers as tarns if they are caused by glacial activity. Tarns are found mostly in the upper reaches of the Himalaya, above 5,500 metres. For more information about these, see here.

Impact on climate

The Himalayas have a profound effect on the climate of the Indian subcontinent and the Tibetan plateau. It prevents frigid, dry Arctic winds from blowing south into the subcontinent, which keeps South Asia much warmer than corresponding temperate regions in the other continents. It also forms a barrier for the monsoon winds, keeping them from traveling northwards, and causing heavy rainfall in the Terai region. The Himalayas are also believed to play an important part in the formation of Central Asian deserts such as the Taklamakan and Gobi deserts.

The mountain ranges also prevent western winter disturbances from Iran from traveling further, resulting in snow in Kashmir and rainfall for parts of Punjab and northern India. Despite being a barrier to the cold northernly winter winds, the Brahmaputra valley receives part of the frigid winds, thus lowering the temperature in the northeast Indian states and Bangladesh. These winds also cause the North East monsoon during this season for these parts.

In turn, the weather phenomenon called Jet Stream affects our image of the highest peaks on earth. The strong stream of winds from the west pass through Everest, creating a familiar plume of snows blowing from the summit, and visible from a great distance.

Mountain passes

The rugged terrain of the Himalaya makes few routes through the mountains possible. Some of these routes include:

• Gangtok in Sikkim to Lhasa in Tibet, via the Nathula Pass and Jelepla Passes (offshoots of the ancient Silk Road).
• Bhadgaon in Nepal to Nyalam in Tibet.
• Rohtang Pass in Himachal Pradesh, India.
• The road from Srinagar in Kashmir via Leh to Tibet. This pass is now less used because of regional troubles. Many people are affected.
• Mohan Pass is the principal pass in the Siwalik Hills, the southern most and geologically youngest foothills running parallel to the main Himalayas in Sikkim.

Impact on politics and culture

The Himalayas, due to their large size and expanse, have been a natural barrier to the movement of people for tens of thousands of years. In particular, this has prevented intermingling of people from the Indian subcontinent with people from China and Mongolia, causing significantly different languages and customs between these regions. The Himalayas have also hindered trade routes and prevented military expeditions across its expanse. For instance, Genghis Khan could not expand his empire south of the Himalayas into the subcontinent.

Himal

Himal is Nepalese for "mountain" and is used to name the various mountains of the Himalayas. In Nepal, these are as follows:

• Sagarmatha Himal
• Annapurna Himal
• Ganesh Himal
• Langtang Himal
• Manaslu Himal
• Rolwaling Himal
• Jugal Himal
• Gauri Sankar Himal
• Kanjirowa Himal
• Khumbu Himal
• Dhaulagiri Himal

Notable peaks

Notable Himalayan Mountaineers

• George Mallory (1886–1924) Attempt at first ascent of Mount Everest; died on North Face.
• Noel Odell (1890–1987) British. First ascent, in 1936, of Nanda Devi, which remained the highest summited peak until 1950.
• Bill Tilman (1898–1977) British. First ascent of Nanda Devi in 1936. In 1934, first person to penetrate Nanda Devi sanctuary
• Eric Shipton (1907–1977) British. With Bill Tillman, first to penetrate Nanda Devi sanctuary. Discovered route to Everest over Khumbu Glacier.
• John Hunt (1910–1998) British. Leader of 1953 expedition of Mount Everest.
• Tenzing Norgay (1914–1986) Nepalese Sherpa mountaineer. First man on Everest along with Edmund Hillary.
• Maurice Herzog (b. 1919) First person to summit an Eight-thousander, Annapurna, in 1950. Lost all toes and most fingers due to frostbite. Peak not climbed again until 1970.
• Sir Edmund Hillary (born 1919) New Zealand mountaineer and explorer, the first man on Everest with Tenzing Norgay.
• Tom Bourdillon (1924–1956) member of British Everest expeditions 1951, 1952, and 1953, reached 300 feet from summit of Everest three days before Edmund Hillary and Tenzing Norgay finally conquered it.
• Hermann Buhl (1924–1957) First ascent of Nanga Parbat in 1953 (feat accomplished solo and without oxygen). First ascent of Broad Peak. Died in fall on Chogolisa, body never found.
• Willi Unsoeld (1926–1979) United States. First ascent of Everest from West Face, 1963. Daughter Nanda Devi Unsoeld killed during Nanda Devi expedition 1976. Died during avalanche on Mount Ranier, 1979.
• Chris Bonington (b. 1934) First ascent of Annapurna (South Face), 4 ascents of Everest.
• Nawang Gombu (b. 1936) Indian mountaineer. First person to climb Everest twice: 1963 and 1965.
• Jim Whittaker (b. 1936) United States. First American to summit Everest.
• Reinhold Messner (born 1944) Italian mountaineer. First man to climb all fourteen eight-thousanders.
• Jerzy Kukuczka (1948–1989) Polish mountaineer. Ascended all fourteen eight-thousanders faster than anybody else, establishing ten new routes.
• Nazir Sabir Pakistani mountaineer. First ascent of two eight thousanders (Broad Peak & Gasherbrum II) in a single attempt.

Religion and mythology

Several places in the Himalaya are of religious significance in Hinduism and Buddhism. In Hinduism, the Himalaya have also been personified as the god Himavat, the father of Shiva's consort, Parvati.

• Haridwar, the place where the river Ganga enters the plains.
• Badrinath, a temple dedicated to Vishnu.
• Kedarnath, where one of the 12 Jyotirlingas is located.
• Gaumukh, the source of the Bhagirathi (and hence, by extension, the Ganga), located a few miles above the town of Gangotri.
• Deoprayag, where the Alaknanda and Bhagirathi merge to form the Ganga.
• Rishikesh, has a temple of Lakshmana.
• Mount Kailash, a 6,638 m high peak which is considered to be the abode of the Hindu god Shiva and is also venerated by Buddhists. Lake Manasarowar lies at the base of Mount Kailash, and is the source of the Brahmaputra.
• Amarnath, has a natural Shiva linga of ice which forms for a few weeks each year. Thousands of people visit this cave during these few weeks.
• The Vaishno Devi is a popular shrine among Durga devotees.
• A number of Tibetan Buddhist sites are situated in the Himalaya, including the residence of the Dalai Lama.
• The Yeti is one of the most famous creatures in cryptozoology. It is a large primate-like creature that is supposed to live in the Himalaya. Most mainstream scientists and experts consider current evidence of the Yeti's existence unpersuasive, and the result of hoaxes, legend or misidentification of mundane creatures.
• Shambhala is a mystical city in Buddhism with various legends associated with it. While some legends consider it to be a real city where secret Buddhist doctrines are being preserved, other legends believe that the city does not physically exist and can only be reached in the mental realm.
• Sri Hemkund Sahib - Sikh Gurudwara where Guru Gobind Singh supposedly meditated and achieved enlightenment in a previous incarnation.

The Himalayas in fiction

• Shangri-La is a fictional utopia situated somewhere in the Himalayas, based on the legendary Shambhala. It is described in the novel Lost Horizon, written by the British writer James Hilton in 1933.
• Tintin in Tibet is one of the series of classic comic-strip albums, written and illustrated by Belgian writer and illustrator Hergé, featuring the young reporter Tintin investigating a plane crash in the Gosain Than massif in the Himalayas. (1960)
• The Hollywood movie Vertical Limit (2000), is set in the K2 peak of the Himalayas, in Pakistan.
• Several levels of Tomb Raider 2 and one level in Tomb Raider: Legend of the Tomb Raider series are situated in the Himalayas.
• The Inheritance of Loss written by Kiran Desai is partly set in the Himalaya Mountains. It won the Man Booker Prize in 2006.
• Rumer Godden's novel "Black Narcissus" (1939) is about an order of nuns who set up a convent in the Himalayas. The film, released in 1947 by Powell and Pressburger and starring Deborah Kerr, was not actually shot in the Himalayas and relied primarily on matte paintings to evoke the mountains.

See also

• Baltistan
• Eight-thousander - a list of peaks over 8,000 metres
• Geography of China
• Himalayan Towers
• Karakoram Highway
• Karakoram Mountain Range
• Ladakh
• List of highest mountains - all mountains over 7,200 meters
• List of mountains in Pakistan
• Mountain ranges of Pakistan
• Trekking peak
• Yeti

Notes

1. Oracle Education Foundation: Indian Himalayas
2. Gaillardet, J (2003). "Geochemistry of the Suspended Sediments of Circum-Himalayan Rivers and Weathering Budgets over the Last 50 Myrs" (PDF). Geophysical Research Abstracts. 5 (13617). Retrieved 2006-11-04. {{cite journal}}: Cite has empty unknown parameters: |month= and |quotes= (help); Unknown parameter |coauthors= ignored (|author= suggested) (help)

Further reading

• Michael Palin, Himalaya, Weidenfeld Nicolson Illustrated (2004) ISBN 0-297-84371-0
• John Hunt, Ascent of Everest, Hodder & Stoughton (1956) ISBN 0-89886-361-9
• Everest, the IMAX movie (1998), ISBN 0-7888-1493-1

References

The Himalayan Journal published by Himalayan Club

External links

• Comprehensive Information about the mountains of Himalaya with links to good images
• Harish Kapadia
• The making of the Himalaya and major tectonic subdivisions
• Geology of the Himalayan mountains
• Birth of the Himalaya
• Some notes on the formation of the Himalaya
• Guide to the 8000 m peaks
• Pictures from a trek in Annapurna (film by Ori Liber)

• Biodiversity hotspots
• Mountain ranges of Asia
• Mountain ranges of India
• Himalaya