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The Himalayas, or Himalaya (; ; ), is a mountain range in Asia, separating the plains of the Indian subcontinent from the Tibetan Plateau. The range has some of the planet's highest peaks, including the very highest, Mount Everest. Over 100 peaks exceeding in elevation lie in the Himalayas. By contrast, the highest peak outside Asia ( Aconcagua, in the Andes) is tall. The Himalayas abut or cross five countries: Bhutan, India, Nepal, China, and Pakistan. The sovereignty of the range in the
Kashmir Kashmir () is the northernmost geographical region of the Indian subcontinent. Until the mid-19th century, the term "Kashmir" denoted only the Kashmir Valley between the Great Himalayas and the Pir Panjal Range. Today, the term encompas ...
region is disputed among India, Pakistan, and China. The Himalayan range is bordered on the northwest by the
Karakoram The Karakoram is a mountain range in Kashmir region spanning the borders of Pakistan, China, and India, with the northwest extremity of the range extending to Afghanistan and Tajikistan. Most of the Karakoram mountain range falls under the ...
and Hindu Kush ranges, on the north by the Tibetan Plateau, and on the south by the
Indo-Gangetic Plain The Indo-Gangetic Plain, also known as the North Indian River Plain, is a fertile plain encompassing northern regions of the Indian subcontinent, including most of northern and eastern India, around half of Pakistan, virtually all of Bangla ...
. Some of the world's major rivers, the
Indus The Indus ( ) is a transboundary river of Asia and a trans-Himalayan river of South and Central Asia. The river rises in mountain springs northeast of Mount Kailash in Western Tibet, flows northwest through the disputed region of Kashmir, ...
, the Ganges, and the TsangpoBrahmaputra, rise in the vicinity of the Himalayas, and their combined drainage basin is home to some 600 million people; 53 million people live in the Himalayas. The Himalayas have profoundly shaped the cultures of South Asia and Tibet. Many Himalayan peaks are sacred in Hinduism and Buddhism; the summits of several— Kangchenjunga (from the Indian side),
Gangkhar Puensum Gangkhar Puensum ( dz, གངས་དཀར་སྤུན་གསུམ་, translit=Kangkar Punsum, alternatively, Gangkar Punsum or Gankar Punzum) is the highest mountain in Bhutan and the highest unclimbed mountain in the world, with an ele ...
, Machapuchare, Nanda Devi and Kailas in the Tibetan Transhimalaya—are off-limits to climbers. Lifted by the
subduction Subduction is a geological process in which the oceanic lithosphere is recycled into the Earth's mantle at convergent boundaries. Where the oceanic lithosphere of a tectonic plate converges with the less dense lithosphere of a second plate, the ...
of the Indian tectonic plate under the Eurasian Plate, the Himalayan mountain range runs west-northwest to east-southeast in an arc long. Its western anchor, Nanga Parbat, lies just south of the northernmost bend of the Indus river. Its eastern anchor, Namcha Barwa, lies immediately west of the great bend of the Yarlung Tsangpo River. The range varies in width from in the west to in the east.


Name

The name of the range hails from the Sanskrit ( 'abode of the snow'), from ( 'snow') and ( 'home, dwelling'). They are now known as "", usually shortened to "the Himalayas". The mountains are known as the in
Nepali Nepali or Nepalese may refer to : Concerning Nepal * Anything of, from, or related to Nepal * Nepali people, citizens of Nepal * Nepali language, an Indo-Aryan language found in Nepal, the current official national language and a language spoken ...
and Hindi (both written ), ''Himāl'' (हिमाल) in Kumaoni, the ''Himalaya'' () or 'The Land of Snow' () in
Tibetan Tibetan may mean: * of, from, or related to Tibet * Tibetan people, an ethnic group * Tibetan language: ** Classical Tibetan, the classical language used also as a contemporary written standard ** Standard Tibetan, the most widely used spoken dial ...
, also known as in Sinhala written as , the ''Himāliya'' Mountain Range () in Urdu, the ''Himaloy Parvatmala'' () in Bengali and the ''Ximalaya'' Mountain Range ( zh, s=喜马拉雅 山脉, p=Xǐmǎlāyǎ Shānmài, c=, t=喜馬拉雅 山脉) in Chinese. The name of the range is sometimes also given as Himavan in older writings, including the Sanskrit epic Mahabharata. Himavat ( Sanskrit: हिमवत्'')'' or Himavan Himavān ( Sanskrit: हिमवान्) is a Hindu deity who is the personification of the Himalayan Mountain Range. Other epithets include Himaraja ( Sanskrit: हिमराज, ) or Parvateshwara ( Sanskrit: पर्वतेश्वर, ). In western literature, some writers refer to it as ''the Himalaya''. This was also previously transcribed as ''Himmaleh'', as in Emily Dickinson's poetry and
Henry David Thoreau Henry David Thoreau (July 12, 1817May 6, 1862) was an American naturalist, essayist, poet, and philosopher. A leading Transcendentalism, transcendentalist, he is best known for his book ''Walden'', a reflection upon simple living in natural su ...
's essays.


Geography and key features

The Himalayas consist of parallel mountain ranges: the Sivalik Hills on the south; the Lower Himalayan Range; the Great Himalayas, which is the highest and central range; and the
Tibetan Himalayas The geology of Nepal is dominated by the Himalaya, the highest, youngest and a very highly active mountain range. Himalaya is a type locality for the study of on-going continent-continent collision tectonics. The Himalayan arc extends about fro ...
on the north. The
Karakoram The Karakoram is a mountain range in Kashmir region spanning the borders of Pakistan, China, and India, with the northwest extremity of the range extending to Afghanistan and Tajikistan. Most of the Karakoram mountain range falls under the ...
are generally considered separate from the Himalayas. In the middle of the great curve of the Himalayan mountains lie the peaks of Dhaulagiri and Annapurna in Nepal, separated by the Kali Gandaki Gorge. The gorge splits the Himalayas into Western and Eastern sections both ecologically and orographically – the pass at the head of the Kali Gandaki the
Kora La Korala or Kora La or Koro La ( Nepali: ; literally ''Kora Pass'') is a mountain pass between Tibet and Upper Mustang. At only in elevation, it has been considered the lowest drivable path between Tibetan Plateau and the Indian subcontinent. It is ...
is the lowest point on the ridgeline between Everest and K2 (the highest peak of the Karakoram range). To the east of Annapurna are the peaks of Manaslu and across the border in Tibet, Shishapangma. To the south of these lies Kathmandu, the capital of Nepal and the largest city in the Himalayas. East of the
Kathmandu Valley The Kathmandu Valley ( ne, काठमाडौं उपत्यका; also known as the Nepal Valley or Nepa Valley ( ne, नेपाः उपत्यका, Nepal Bhasa: 𑐣𑐾𑐥𑐵𑑅 𑐐𑐵𑑅, नेपाः गाः)), ...
lies the valley of the Bhote/ Sun Kosi river which rises in Tibet and provides the main overland route between Nepal and China – the Araniko Highway/ China National Highway 318. Further east is the Mahalangur Himal with four of the world's six highest mountains, including the highest:
Cho Oyu __NOTOC__ Cho Oyu (Nepali: चोयु; ; ) is the sixth-highest mountain in the world at above sea level. Cho Oyu means "Turquoise Goddess" in Tibetan. The mountain is the westernmost major peak of the ''Khumbu'' sub-section of the Mahalangur ...
, Everest, Lhotse and Makalu. The Khumbu region, popular for trekking, is found here on the south-western approaches to Everest. The Arun river drains the northern slopes of these mountains, before turning south and flowing to the range to the east of Makalu. In the far east of Nepal, the Himalayas rise to the Kangchenjunga massif on the border with India, the third highest mountain in the world, the most easterly summit and the highest point of India. The eastern side of Kangchenjunga is in the Indian state of Sikkim. Formerly an independent Kingdom, it lies on the main route from India to Lhasa, Tibet, which passes over the Nathu La pass into Tibet. East of Sikkim lies the ancient Buddhist Kingdom of Bhutan. The highest mountain in Bhutan is
Gangkhar Puensum Gangkhar Puensum ( dz, གངས་དཀར་སྤུན་གསུམ་, translit=Kangkar Punsum, alternatively, Gangkar Punsum or Gankar Punzum) is the highest mountain in Bhutan and the highest unclimbed mountain in the world, with an ele ...
, which is also a strong candidate for the highest unclimbed mountain in the world. The Himalayas here are becoming increasingly rugged with heavily forested steep valleys. The Himalayas continue, turning slightly northeast, through the Indian State of Arunachal Pradesh as well as Tibet, before reaching their easterly conclusion in the peak of Namche Barwa, situated in Tibet inside the great bend of the Yarlang Tsangpo river. On the other side of the Tsangpo, to the east, are the Kangri Garpo mountains. The high mountains to the north of the Tsangpo including Gyala Peri, however, are also sometimes included in the Himalayas. Going west from Dhaulagiri, Western Nepal is somewhat remote and lacks major high mountains, but is home to Rara Lake, the largest lake in Nepal. The Karnali River rises in Tibet but cuts through the centre of the region. Further west, the border with India follows the Sarda River and provides a trade route into China, where on the Tibetan plateau lies the high peak of Gurla Mandhata. Just across Lake Manasarovar from this lies the sacred Mount Kailash in the
Kailash Ranges The Kailash Range, Kailas Range, Gangdisi Mountains, Gangdese Range, Gangdisê Range or Gangdise Shan, is a mountain range on the Tibetan Plateau in Tibet and the Tibet Autonomous Region. Geography It is the western subrange of the Transhimalaya ...
, which stands close to the source of the four main rivers of Himalayas and is revered in Hinduism, Buddhism, Sufism, Jainism, and Bonpo. In Uttarakhand, the Himalayas rise again as the Kumaon and Garhwal Himalayas with the high peaks of Nanda Devi and Kamet. The state is also home to the important pilgrimage destinations of
Chaar Dhaam ''Chaar'' (English: Four) is a 2014 Indian Bengali anthology film, directed by Sandip Ray and produced by Shrikant Mohta, Mahendra Soni and Nispal Singh under the banner of Shree Venkatesh Films and Surinder Films. It based on four stories by d ...
, with
Gangotri Gangotri is a town and a ''Nagar Panchayat'' (municipality) in Uttarkashi district in the state of Uttarakhand, India. It is 99 km from Uttarkashi, the main district headquarter. It is a Hindu pilgrim town on the banks of the river Bhagirathi ...
, the source of the holy river Ganges, Yamunotri, the source of the river Yamuna, and the temples at Badrinath and Kedarnath. Uttarakhand Himalayas are regionally divided into two, namely, Kumaon hills in Kumaon division and Garhwal hills in Garhwal division. The next Himalayan Indian state, Himachal Pradesh, is noted for its hill stations, particularly Shimla, the summer capital of the British Raj, and Dharamsala, the centre of the Tibetan community and government in exile in India. This area marks the start of the
Punjab Himalaya The Western Himalayas refers to the western half of the Himalayas, in northern Pakistan and northwestern India. It is also known as the Punjab Himalayas. Four of the five tributaries of the Indus River in Punjab (Beas, Chenab, Jhelum, and Ravi) ...
and the
Sutlej river The Sutlej or Satluj River () is the longest of the five rivers that flow through the historic crossroads region of Punjab in northern India and Pakistan. The Sutlej River is also known as ''Satadru''. It is the easternmost tributary of the Ind ...
, the most easterly of the five tributaries of the
Indus The Indus ( ) is a transboundary river of Asia and a trans-Himalayan river of South and Central Asia. The river rises in mountain springs northeast of Mount Kailash in Western Tibet, flows northwest through the disputed region of Kashmir, ...
, cuts through the range here. Further west, the Himalayas form much of the disputed Indian-administered union territory of
Jammu and Kashmir Jammu and Kashmir may refer to: * Kashmir, the northernmost geographical region of the Indian subcontinent * Jammu and Kashmir (union territory), a region administered by India as a union territory * Jammu and Kashmir (state), a region administered ...
where lies the renowned
Kashmir Valley The Kashmir Valley, also known as the ''Vale of Kashmir'', is an intermontane valley concentrated in the Kashmir Division of the Indian- union territory of Jammu and Kashmir. The valley is bounded on the southwest by the Pir Panjal Range and ...
and the town and lakes of
Srinagar Srinagar (English: , ) is the largest city and the summer capital of Jammu and Kashmir, India. It lies in the Kashmir Valley on the banks of the Jhelum River, a tributary of the Indus, and Dal and Anchar lakes. The city is known for its natu ...
. The Himalayas form most of the south-west portion of the disputed Indian-administered union territory of Ladakh. The twin peaks of Nun Kun are the only mountains over in this part of the Himalayas. Finally, the Himalayas reach their western end in the dramatic 8000 m peak of Nanga Parbat, which rises over above the Indus valley and is the most westerly of the 8000 m summits. The western end terminates at a magnificent point near Nanga Parbat where the Himalayas intersect with the Karakoram and Hindu Kush ranges, in the disputed Pakistani-administered territory of
Gilgit-Baltistan Gilgit-Baltistan (; ), formerly known as the Northern Areas, is a region administered by Pakistan as an administrative territory, and constituting the northern portion of the larger Kashmir region which has been the subject of a dispute bet ...
. Some portion of the Himalayas, such as the Kaghan Valley, Margalla Hills and Galyat tract, extend into the Pakistani provinces of Khyber Pakhtunkhwa and Punjab.


Geology

The Himalayan range is one of the youngest mountain ranges on the planet and consists mostly of uplifted sedimentary and metamorphic rock. According to the modern theory of plate tectonics, its formation is a result of a
continental collision In geology, continental collision is a phenomenon of plate tectonics that occurs at convergent boundaries. Continental collision is a variation on the fundamental process of subduction, whereby the subduction zone is destroyed, mountains prod ...
or
orogeny Orogeny is a mountain building process. An orogeny is an event that takes place at a convergent plate margin when plate motion compresses the margin. An ''orogenic belt'' or ''orogen'' develops as the compressed plate crumples and is uplifted t ...
along the convergent boundary ( Main Himalayan Thrust) between the Indo-Australian Plate and the Eurasian Plate. The Arakan Yoma highlands in
Myanmar Myanmar, ; UK pronunciations: US pronunciations incl. . Note: Wikipedia's IPA conventions require indicating /r/ even in British English although only some British English speakers pronounce r at the end of syllables. As John C. Wells, Joh ...
and the Andaman and Nicobar Islands in the Bay of Bengal were also formed as a result of this collision. During the Upper Cretaceous, about 70 million years ago, the north-moving Indo-Australian Plate (which has subsequently broken into the Indian Plate and the Australian Plate) was moving at about per year. About 50 million years ago this fast-moving Indo-Australian Plate had completely closed the Tethys Ocean, the existence of which has been determined by sedimentary rocks settled on the ocean floor and the volcanoes that fringed its edges. Since both plates were composed of low density continental crust, they were thrust faulted and folded into mountain ranges rather than subducting into the
mantle A mantle is a piece of clothing, a type of cloak. Several other meanings are derived from that. Mantle may refer to: *Mantle (clothing), a cloak-like garment worn mainly by women as fashionable outerwear **Mantle (vesture), an Eastern Orthodox ve ...
along an oceanic trench. An often-cited fact used to illustrate this process is that the summit of Mount Everest is made of marine limestone from this ancient ocean. Today, the Indian plate continues to be driven horizontally at the Tibetan Plateau, which forces the plateau to continue to move upwards. The Indian plate is still moving at 67 mm per year, and over the next 10 million years it will travel about into Asia. About 20 mm per 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 per 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. During the last ice age, there was a connected ice stream of glaciers between Kangchenjunga in the east and Nanga Parbat in the west. In the west, the glaciers joined with the ice stream network in the
Karakoram The Karakoram is a mountain range in Kashmir region spanning the borders of Pakistan, China, and India, with the northwest extremity of the range extending to Afghanistan and Tajikistan. Most of the Karakoram mountain range falls under the ...
, and in the north, they joined with the former Tibetan inland ice. To the south, outflow glaciers came to an end below an elevation of . While the current valley glaciers of the Himalaya reach at most in length, several of the main valley glaciers were long during the ice age. The glacier snowline (the altitude where accumulation and ablation of a glacier are balanced) was about lower than it is today. Thus, the climate was at least colder than it is today.


Hydrology

Despite their scale, the Himalayas do not form a major watershed, and a number of rivers cut through the range, particularly in the eastern part of the range. As a result, the main ridge of the Himalayas is not clearly defined, and mountain passes are not as significant for traversing the range as with other mountain ranges. The rivers of the Himalayas drain into two large river systems: * The western rivers combine into the ''Indus Basin''. The
Indus The Indus ( ) is a transboundary river of Asia and a trans-Himalayan river of South and Central Asia. The river rises in mountain springs northeast of Mount Kailash in Western Tibet, flows northwest through the disputed region of Kashmir, ...
itself forms the northern and western boundaries of the Himalayas. It begins in Tibet at the confluence of Sengge and Gar rivers and flows north-west through India into Pakistan before turning south-west to the Arabian Sea. It is fed by several major tributaries draining the southern slopes of the Himalayas, including the
Jhelum Jhelum ( Punjabi and ur, ) is a city on the east bank of the Jhelum River, which is located in the district of Jhelum in the north of Punjab province, Pakistan. It is the 44th largest city of Pakistan by population. Jhelum is known for p ...
, Chenab,
Ravi Ravi may refer to: People * Ravi (name), including a list of people and characters with the name * Ravi (composer) (1926–2012), Indian music director * Ravi (Ivar Johansen) (born 1976), Norwegian musical artist * Ravi (music director) (1926–201 ...
, Beas and
Sutlej The Sutlej or Satluj River () is the longest of the five rivers that flow through the historic crossroads region of Punjab in northern India and Pakistan. The Sutlej River is also known as ''Satadru''. It is the easternmost tributary of the Ind ...
rivers, the five rivers of the Punjab. * The other Himalayan rivers drain the ''Ganges-Brahmaputra Basin''. Its main rivers are the Ganges, the Brahmaputra and the Yamuna, as well as other tributaries. The Brahmaputra originates as the Yarlung Tsangpo River in western Tibet, and flows east through Tibet and west through the plains of Assam. The Ganges and the Brahmaputra meet in Bangladesh and drain into the Bay of Bengal through the world's largest river delta, the
Sunderbans Sundarbans (pronounced ) is a mangrove area in Ganges Delta, the delta formed by the confluence of the Padma River, Padma, Brahmaputra River, Brahmaputra and Meghna Rivers in the Bay of Bengal. It spans the area from the Baleswar River in Bang ...
. The northern slopes of Gyala Peri and the peaks beyond the Tsangpo, sometimes included in the Himalayas, drain into the
Irrawaddy River The Irrawaddy River ( Ayeyarwady River; , , from Indic ''revatī'', meaning "abounding in riches") is a river that flows from north to south through Myanmar (Burma). It is the country's largest river and most important commercial waterway. Origi ...
, which originates in eastern Tibet and flows south through Myanmar to drain into the
Andaman Sea The Andaman Sea (historically also known as the Burma Sea) is a marginal sea of the northeastern Indian Ocean bounded by the coastlines of Myanmar and Thailand along the Gulf of Martaban and west side of the Malay Peninsula, and separated from ...
. The Salween, Mekong, Yangtze and 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''.


Glaciers

The great ranges of central Asia, including the Himalayas, contain the third-largest deposit of ice and snow in the world, after Antarctica and the Arctic. The Himalayan range encompasses about 15,000 glaciers, which store about of fresh water. Its glaciers include the
Gangotri Gangotri is a town and a ''Nagar Panchayat'' (municipality) in Uttarkashi district in the state of Uttarakhand, India. It is 99 km from Uttarkashi, the main district headquarter. It is a Hindu pilgrim town on the banks of the river Bhagirathi ...
and Yamunotri ( Uttarakhand) and Khumbu glaciers ( Mount Everest region), Langtang glacier ( Langtang region) and Zemu ( Sikkim). Owing to the mountains' latitude near the Tropic of Cancer, the permanent
snow line The climatic snow line is the boundary between a snow-covered and snow-free surface. The actual snow line may adjust seasonally, and be either significantly higher in elevation, or lower. The permanent snow line is the level above which snow wil ...
is among the highest in the world at typically around . In contrast, equatorial mountains in New Guinea, the
Rwenzoris The Ruwenzori, also spelled Rwenzori and Rwenjura, are a range of mountains in eastern equatorial Africa, located on the border between Uganda and the Democratic Republic of the Congo. The highest peak of the Ruwenzori reaches , and the range' ...
and
Colombia Colombia (, ; ), officially the Republic of Colombia, is a country in South America with insular regions in North America—near Nicaragua's Caribbean coast—as well as in the Pacific Ocean. The Colombian mainland is bordered by the Car ...
have a snow line some lower. The higher regions of the Himalayas are snowbound throughout the year, in spite of their proximity to the tropics, and they form the sources of several large perennial rivers. In recent years, scientists have monitored a notable increase in the rate of glacier retreat across the region as a result of climate change. For example, glacial lakes have been forming rapidly on the surface of debris-covered glaciers in the Bhutan Himalaya during the last few decades. Although the effect of this will not be known for many years, it potentially could mean disaster for the hundreds of millions of people who rely on the glaciers to feed the rivers during the dry seasons. The global climate change will affect the water resources and livelihoods of the Greater Himalayan region.


Lakes

The Himalayan region is dotted with hundreds of lakes. Pangong Tso, which is spread across the border between India and China, at far western end of Tibet, is among the largest with surface areas of . South of the main range, the lakes are smaller. Tilicho Lake in Nepal in the Annapurna massif is one of the highest lakes in the world. Other notable lakes include Rara Lake in western Nepal, She-Phoksundo Lake in the Shey Phoksundo National Park of Nepal, Gurudongmar Lake, in
North Sikkim North Sikkim (now officially named as Mangan District) is a list of Indian districts, district of the Indian states and territories of India, state of Sikkim. Its district headquarters is Mangan, India, Mangan. It is the seventh least populous d ...
, Gokyo Lakes in
Solukhumbu Solukhumbu District ( ne, सोलुखुम्बु जिल्ला , Sherpa: , Wylie: shar khum bu dzong) is one of 14 districts of Province No. 1 of eastern Nepal. As the name suggests, it consists of the subregions Solu and Khumbu. ...
district of Nepal and
Lake Tsongmo Tsomgo Lake'','' also known as Tsongmo Lake or Changgu Lake, is a glacial lake in the East Sikkim district of the Indian state of Sikkim, some from the capital Gangtok. Located at an elevation of , the lake remains frozen during the winter se ...
, near the Indo-China border in Sikkim. Some of the lakes present a danger of a glacial lake outburst flood. The Tsho Rolpa glacier lake in the Rowaling Valley, in the Dolakha District of Nepal, is rated as the most dangerous. The lake, which is located at an altitude of has grown considerably over the last 50 years due to glacial melting. 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 . Temperate Himalayan wetlands provide important habitat and layover sites for migratory birds. Many mid and low altitude lakes remain poorly studied in terms of their hydrology and biodiversity, like Khecheopalri in the Sikkim Eastern Himalayas.


Climate


Temperature

The physical factors determining the climate in any location in the Himalayas include latitude, altitude, and the relative motion of the Southwest monsoon. From south to north, the mountains cover more than eight degrees of latitude, spanning temperate to subtropical zones. The colder air of Central Asia is prevented from blowing down into South Asia by the physical configuration of the Himalayas. This causes the tropical zone to extend farther north in South Asia than anywhere else in the world. The evidence is unmistakable in the Brahmaputra valley as the warm air from the Bay of Bengal bottlenecks and rushes up past Namcha Barwa, the eastern anchor of the Himalayas, and into southeastern Tibet. Temperatures in the Himalayas cool by 2.0 degrees C (3.6 degrees F) for every increase of altitude. As the physical features of mountains are irregular, with broken jagged contours, there can be wide variations in temperature over short distances. Temperature at a location on a mountain depends on the season of the year, the bearing of the sun with respect to the face on which the location lies, and the mass of the mountain, i.e. the amount of matter in the mountain. As the temperature is directly proportional to received radiation from the sun, the faces that receive more direct sunlight also have a greater heat buildup. In narrow valleys—lying between steep mountain faces—there can be dramatically different weather along their two margins. The side to the north with a mountain above facing south can have an extra month of the growing season. The mass of the mountain also influences the temperature, as it acts as a heat island, in which more heat is absorbed and retained than the surroundings, and therefore influences the heat budget or the amount of heat needed to raise the temperature from the winter minimum winter to the summer maximum. The immense scale of the Himalayas means that many summits can create their own weather, the temperature fluctuating from one summit to another, from one face to another, and all may be quite different from the weather in nearby plateaus or valleys.


Precipitation

A critical influence on the Himalayan climate is the Southwest Monsoon. This is not so much the rain of the summer months as the wind that carries the rain. Different rates of heating and cooling between the Central Asian continent and the South Asian ocean create large differences in the atmospheric pressure prevailing above each. In the winter, a high-pressure system forms and remains suspended above Central Asia, forcing air to flow in the southerly direction over the Himalayas. But in Central Asia as there is no substantial source for water to be diffused as vapour, the winter winds blowing across South Asia are dry. In the summer months the Central Asian plateau heats up more than the ocean waters to its south. As a result, the air above it rises higher and higher, creating a zone of low pressure. Off-shore high-pressure systems in the Indian Ocean push the moist summer air inland toward the low-pressure system. When the moist air meets mountains, it rises and upon subsequent cooling, its moisture condenses and is released as rain, typically heavy rain. The wet summer monsoon winds cause precipitation in India and all along the layered southern slopes of the Himalayas. This forced lifting of air is called the
orographic effect Orographic lift occurs when an air mass is forced from a low elevation to a higher elevation as it moves over rising terrain. As the air mass gains altitude it quickly cools down adiabatically, which can raise the relative humidity to 100% and cr ...
.


Winds

The vast size, huge altitude range, and complex topography of the Himalayas mean they experience a wide range of climates, from humid subtropical in the foothills to cold and dry desert conditions on the Tibetan side of the range. For much of the Himalayas—in the areas to the south of the high mountains, the monsoon is the most characteristic feature of the climate and causes most of the precipitation, while the western disturbance brings winter precipitation, especially in the west. Heavy rain arrives on the southwest monsoon in June and persists until September. The monsoon can seriously impact transport and cause major landslides. It restricts tourism – the trekking and mountaineering season is limited to either before the monsoon in April/May or after the monsoon in October/November (autumn). In Nepal and Sikkim, there are often considered to be five seasons: summer, monsoon, autumn, (or post-monsoon), winter, and spring. Using the Köppen climate classification, the lower elevations of the Himalayas, reaching in mid-elevations in central Nepal (including the Kathmandu valley), are classified as ''Cwa'',
Humid subtropical climate A humid subtropical climate is a zone of climate characterized by hot and humid summers, and cool to mild winters. These climates normally lie on the southeast side of all continents (except Antarctica), generally between latitudes 25° and 40° ...
with dry winters. Higher up, most of the Himalayas have a subtropical highland climate (''Cwb''). The intensity of the southwest monsoon diminishes as it moves westward along the range, with as much as of rainfall in the monsoon season in Darjeeling in the east, compared to only during the same period in Shimla in the west. The northern side of the Himalayas, also known as the Tibetan Himalaya, is dry, cold and, generally, windswept particularly in the west where it has a cold desert climate. The vegetation is sparse and stunted and the winters are severely cold. Most of the precipitation in the region is in the form of snow during the late winter and spring months. Local impacts on climate are significant throughout the Himalayas. Temperatures fall by 0.2 to 1.2 °C for every rise in altitude. This gives rise to a variety of climates from a nearly tropical climate in the foothills, to tundra and permanent snow and ice at higher elevations. Local climate is also affected by the topography: The leeward side of the mountains receive less rain while the well exposed slopes get heavy rainfall and the
rain shadow A rain shadow is an area of significantly reduced rainfall behind a mountainous region, on the side facing away from prevailing winds, known as its leeward side. Evaporated moisture from water bodies (such as oceans and large lakes) is carrie ...
of large mountains can be significant, for example leading to near desert conditions in the Upper Mustang which is sheltered from the monsoon rains by the Annapurna and Dhaulagiri massifs and has annual precipitation of around , while
Pokhara Pokhara ( ne, पोखरा, ) is a metropolis, metropolitan city in Nepal, which serves as the capital of Gandaki Province. It is the List of cities in Nepal, second most populous city of Nepal after Kathmandu, with 518,452 inhabitants living ...
on the southern side of the massifs has substantial rainfall ( a year). Thus although annual precipitation is generally higher in east than the west, local variations are often more important. The Himalayas have a profound effect on the climate of the Indian subcontinent and the Tibetan Plateau. They prevent frigid, dry 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.


Climate change


Ecology

The flora and fauna of the Himalayas vary 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 southern front of the range. This diversity of altitude, rainfall, and soil conditions combined with the very high snow line supports a variety of distinct plant and animal communities. The extremes of high altitude (low atmospheric pressure) combined with extreme cold favor extremophile organisms. At high altitudes, the elusive and previously endangered snow leopard is the main predator. Its prey includes members of the goat family grazing on the alpine pastures and living on the rocky terrain, notably the endemic bharal or Himalayan blue sheep. The Himalayan musk deer is also found at high altitudes. Hunted for its musk, it is now rare and endangered. Other endemic or near-endemic herbivores include the Himalayan tahr, the takin, the Himalayan serow, and the Himalayan goral. The critically endangered Himalayan subspecies of the brown bear is found sporadically across the range as is the
Asian black bear The Asian black bear (''Ursus thibetanus''), also known as the Asiatic black bear, moon bear and white-chested bear, is a medium-sized bear species native to Asia that is largely adapted to an arboreal lifestyle. It lives in the Himalayas, sout ...
. In the mountainous mixed deciduous and conifer forests of the eastern Himalayas, Red panda feed in the dense understories of bamboo. Lower down the forests of the foothills are inhabited by several different primates, including the endangered Gee's golden langur and the Kashmir gray langur, with highly restricted ranges in the east and west of the Himalayas respectively. The unique floral and faunal wealth of the Himalayas is undergoing structural and compositional changes due to climate change. '' Hydrangea hirta'' is an example of floral species that can be found in this area. The increase in temperature is shifting various species to higher elevations. The oak forest is being invaded by pine forests in the Garhwal Himalayan region. There are reports of early flowering and fruiting in some tree species, especially
rhododendron ''Rhododendron'' (; from Ancient Greek ''rhódon'' "rose" and ''déndron'' "tree") is a very large genus of about 1,024 species of woody plants in the heath family (Ericaceae). They can be either evergreen or deciduous. Most species are nati ...
, apple and '' box myrtle''. The highest known tree species in the Himalayas is ''
Juniperus tibetica ''Juniperus tibetica'', the Tibetan juniper, is a species of juniper, native to western China in southern Gansu, southeastern Qinghai, Sichuan, and Tibet Autonomous Region, where it grows at high to very high altitudes of . This species has t ...
'' located at in Southeastern Tibet.


Religions

There are many cultural and mythological aspects associated with the Himalayas. In Jainism, Mount Ashtapad of the Himalayan mountain range, is a sacred place where the first Jain Tirthankara, Rishabhdeva attained moksha. It is believed that after Rishabhdeva attained '' nirvana'', his son, Emperor Bharata Chakravartin, had constructed three stupas and twenty four shrines of the 24 Tirthankaras with their idols studded with precious stones over there and named it ''Sinhnishdha''. For the Hindus, the Himalayas are personified as Himavat, king of all mountains and the father of the goddess Parvati. The Himalayas are also considered to be the father of
Ganga The Ganges ( ) (in India: Ganga ( ); in Bangladesh: Padma ( )). "The Ganges Basin, known in India as the Ganga and in Bangladesh as the Padma, is an international river to which India, Bangladesh, Nepal and China are the riparian states." is ...
(the personification of river Ganges). Two of the most sacred places of pilgrimage for the Hindus are the temple complex in Pashupatinath and Muktinath, also known as Saligrama because of the presence of the sacred black rocks called saligrams. The
Buddhists Buddhism ( , ), also known as Buddha Dharma and Dharmavinaya (), is an Indian religion or philosophical tradition based on teachings attributed to the Buddha. It originated in northern India as a -movement in the 5th century BCE, and gra ...
also lay a great deal of importance on the Himalayas. Paro Taktsang is the holy place where Buddhism started in Bhutan. The Muktinath is also a place of pilgrimage for the Tibetan Buddhists. They believe that the trees in the poplar grove came from the walking sticks of eighty-four ancient Indian Buddhist magicians or ''mahasiddhas''. They consider the saligrams to be representatives of the Tibetan serpent deity known as Gawo Jagpa. The Himalayan people's diversity shows in many different ways. It shows through their architecture, their languages, and dialects, their beliefs and rituals, as well as their clothing. The shapes and materials of the people's homes reflect their practical needs and beliefs. Another example of the diversity amongst the Himalayan peoples is that handwoven textiles display colors and patterns unique to their ethnic backgrounds. Finally, some people place great importance on jewelry. The Rai and Limbu women wear big gold earrings and nose rings to show their wealth through their jewelry. Several places in the Himalayas are of religious significance in Hinduism, Buddhism, Jainism and Sikhism. A notable example of a religious site is Paro Taktsang, where Padmasambhava is said to have founded Buddhism in Bhutan. A number of Vajrayana Buddhist sites are situated in the Himalayas, in Tibet, Bhutan and in the Indian regions of Ladakh, Sikkim, Arunachal Pradesh, Spiti and Darjeeling. There were over 6,000 monasteries in Tibet, including the residence of the Dalai Lama. Bhutan, Sikkim and Ladakh are also dotted with numerous monasteries.


Resources

The Himalayas are home to a diversity of medicinal resources. Plants from the forests have been used for millennia to treat conditions ranging from simple coughs to snake bites. Different parts of the plants – root, flower, stem, leaves, and bark – are used as remedies for different ailments. For example, a bark extract from an '' Abies pindrow'' tree is used to treat coughs and bronchitis. Leaf and stem paste from an '' Andrachne cordifolia'' is used for wounds and as an antidote for snake bites. The bark of a ''
Callicarpa arborea ''Callicarpa'' (beautyberry) is a genus of shrubs and small trees in the family Lamiaceae.Heywood, V.H., Brummitt, R.K., Culham, A. & Seberg, O. 2007: Flowering Plant Families of the World. Royal Botanic Gardens, Kew. They are native to east a ...
'' is used for skin ailments. Nearly a fifth of the gymnosperms, angiosperms and
pteridophyte A pteridophyte is a vascular plant (with xylem and phloem) that disperses spores. Because pteridophytes produce neither flowers nor seeds, they are sometimes referred to as "cryptogams", meaning that their means of reproduction is hidden. Ferns, ...
s in the Himalayas are found to have medicinal properties, and more are likely to be discovered. Most of the population in some Asian and African countries depends on medicinal plants rather than prescriptions and such. Since so many people use medicinal plants as their only source of healing in the Himalayas, the plants are an important source of income. This contributes to economic and modern industrial development both inside and outside the region. The only problem is that locals are rapidly clearing the forests on the Himalayas for wood, often illegally.


See also

* Eastern and Western Himalaya * Indian Himalayan Region * List of Himalayan peaks and passes *
List of Himalayan topics The Himalaya are a vast mountain chain in Asia that span multiple countries, including China and India. The Himalaya contain the highest peaks in the world, Mount Everest and K2. These peaks have been attracting mountaineers from around the worl ...
* List of mountains in India, Pakistan, Bhutan, Nepal and
China China, officially the People's Republic of China (PRC), is a country in East Asia. It is the world's most populous country, with a population exceeding 1.4 billion, slightly ahead of India. China spans the equivalent of five time zones and ...
* List of Ultras of the Himalayas * Trekking peak


References


Sources


General

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Geology

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Climate

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Ecology


Society


Pilgrimage and Tourism

* * * * * * * *


Mountaineering and Trekking


Further reading

* Aitken, Bill, ''Footloose in the Himalaya'', Delhi, Permanent Black, 2003. . * Berreman, Gerald Duane, ''Hindus of the Himalayas: Ethnography and Change'', 2nd rev. ed., Delhi, Oxford University Press, 1997. * Edmundson, Henry, ''Tales from the Himalaya'', Vajra Books, Kathmandu, 2019. . * ''Everest'', the IMAX movie (1998). . * Fisher, James F., ''Sherpas: Reflections on Change in Himalayan Nepal'', 1990. Berkeley, University of California Press, 1990. . * Gansser, Augusto, Gruschke, Andreas, Olschak, Blanche C., ''Himalayas. Growing Mountains, Living Myths, Migrating Peoples'', New York, Oxford: Facts On File, 1987. and New Delhi: Bookwise, 1987. * Gupta, Raj Kumar, ''Bibliography of the Himalayas'', Gurgaon, Indian Documentation Service, 1981. * Hunt, John, ''Ascent of Everest'', London, Hodder & Stoughton, 1956. . * Isserman, Maurice and Weaver, Stewart, ''Fallen Giants: The History of Himalayan Mountaineering from the Age of Empire to the Age of Extremes''. Yale University Press, 2008. . * Ives, Jack D. and Messerli, Bruno, ''The Himalayan Dilemma: Reconciling Development and Conservation''. London / New York, Routledge, 1989. . * Lall, J.S. (ed.) in association with Moddie, A.D., ''The Himalaya, Aspects of Change''. Delhi, Oxford University Press, 1981. . * Nandy, S.N., Dhyani, P.P. and Samal, P.K.,
Resource Information Database of the Indian Himalaya
', Almora, GBPIHED, 2006. *
Swami Sundaranand Swami Sundaranand (April 1926 – 23 December 2020) was an Indian Yogi, photographer, author and mountaineer who lectured widely in India on threats to the Ganges River and the loss of Himalayan glaciers due to global warming. Biography S ...
, ''Himalaya: Through the Lens of a Sadhu''. Published by Tapovan Kuti Prakashan (2001). . * Swami Tapovan Maharaj, ''Wanderings in the Himalayas'', English Edition, Madras, Chinmaya Publication Trust, 1960. Translated by T.N. Kesava Pillai. * Tilman, H. W., ''Mount Everest, 1938'', Cambridge University Press, 1948. * Turner, Bethan, et al. ''Seismicity of the Earth 1900–2010: Himalaya and Vicinity''. Denver, United States Geological Survey, 2013.


External links


The Digital Himalaya research project at Cambridge and Yale
(archived)




South Asia's Troubled Waters
Journalistic project at the Pulitzer Centre for Crisis Reporting (archived)
Biological diversity in the Himalayas
Encyclopedia of Earth {{Uttarakhand Mountain ranges Mountain ranges of China Geography of East Asia Geography of South Asia Landforms of East Asia Landforms of South Asia Physiographic divisions Tibetan Plateau