Himalayas
The Himalayas began forming 70 million years ago when the Indian tectonic plate collided with the Eurasian plate. This massive geological event pushed the oceanic crust of India under the Asian continent. Geophysicist Peter Molnar described most of the range as slices of rock that were once the top part of India's crust. The collision created a process called orogeny, which built the mountains through folding and stacking layers of rock known as nappes. The Indian continental plate was too buoyant to subduct fully, so it piled up in sheets ahead of the subduction zone. This lateral compression caused the plate to shear horizontally while its lower crust slid underneath. The resulting mountain range runs west-northwest to east-southeast for thousands of kilometers. Two specific points mark the ends of this arc: Nanga Parbat in the northwest and Namcha Barwa in the northeast. These syntaxes are characterized by rapid upward movement of rocks that were once deeply buried. Geologists estimate these rocks rise at about five millimeters per year. The region remains seismically active today due to the ongoing convergence of the plates.
More than 15,000 glaciers cover the Himalayan range, storing approximately 3600 to 4400 gigatons of fresh water. Scientists refer to this region as the Third Pole because it holds the third-largest deposit of ice and snow on Earth after Antarctica and the Arctic. Major rivers like the Indus, Ganges, and Brahmaputra originate from these frozen sources. The Gangotri and Yamunotri glaciers feed the holy river Ganges in Uttarakhand. The Khumbu glacier lies near Mount Everest in Nepal's Sagarmatha National Park. Recent studies show a notable increase in glacial retreat across the region over the last 40 to 50 years. Researchers measured an overall decrease in glacial coverage of about 13 percent during this period. Local conditions cause loss rates to vary from a few meters per year to 61 meters per year. A marked acceleration in mass loss has been observed since 1975. This melting threatens hundreds of millions of people who rely on the glaciers for dry season water supplies. Some lakes formed by melting glaciers pose severe risks. The Tsho Rolpa lake in Dolakha District is rated as the most dangerous due to its potential for outburst floods.
The Himalayan range crosses territories of five countries: Nepal, India, China, Bhutan, and Pakistan. More than 100 peaks exceed elevations of 7200 meters above sea level within these borders. The sovereignty of the range in the Kashmir region remains disputed among India, Pakistan, and China. The western anchor Nanga Parbat rises over 8000 meters above the Indus valley. It is the most westerly of the eight-thousand-meter summits. The eastern end terminates at Namcha Barwa inside the great bend of the Yarlung Tsangpo river. Kathmandu serves as the capital of Nepal and the largest city in the Himalayas. Shimla was the summer capital of the British Raj before independence. Dharamsala hosts the center of the Tibetan community and government in exile in India. The disputed Indian-administered union territory of Ladakh contains twin peaks called Nun Kun. These are the only mountains over 7000 meters in that part of the range. Some portions extend into Pakistani provinces like Khyber Pakhtunkhwa and Punjab. The Karakoram and Hindu Kush ranges border the Himalayas on the northwest side.
At high altitudes, the elusive snow leopard hunts members of the goat family grazing on alpine pastures. The endemic bharal or Himalayan blue sheep lives on rocky terrain alongside them. The Himalayan musk deer is now rare and endangered due to hunting for its musk. Red pandas feed in dense bamboo understories within mixed deciduous forests of the eastern Himalayas. Endangered primates include Gee's golden langur restricted to the east and Kashmir gray langur found in the west. Oak forests are being invaded by pine forests in the Garhwal region. Hydrangea hirta represents a floral species unique to this area. The highest known tree species is Juniperus tibetica located at 4800 meters in Southeastern Tibet. Temperatures fall by 2.0 degrees Celsius for every 1000 meters of altitude gain. This creates distinct plant communities ranging from tropical foothills to permanent ice zones. Climate change shifts various species to higher elevations. Early flowering and fruiting occur in rhododendron, apple, and box myrtle trees. Nearly one-fifth of gymnosperms, angiosperms, and pteridophytes possess medicinal properties.
In Jainism, Mount Ashtapada is a sacred place where Rishabhanatha attained moksha. Hindus personify the Himalayas as Himavat, the king of all mountains and father of goddess Parvati. Two of the most sacred pilgrimage sites for Hindus are Pashupatinath temple complex and Muktinath. Buddhists consider Paro Taktsang holy because Padmasambhava founded Buddhism there in Bhutan. Over 6000 monasteries existed in Tibet including the residence of the Dalai Lama. Bhutan, Sikkim, and Ladakh contain numerous monasteries scattered across their landscapes. The summits of several peaks remain off-limits to climbers. Kangchenjunga from the Indian side, Gangkhar Puensum, Machapuchare, Nanda Devi, and Kailash are forbidden grounds. Mount Kailash stands close to the source of four main rivers and is revered in Hinduism, Jainism, Buddhism, Sufism, and Bonpo. Handwoven textiles display colors unique to ethnic backgrounds. Rai and Limbu women wear big gold earrings and nose rings to show wealth through jewelry. Local architecture reflects practical needs and spiritual beliefs.
The Southwest Monsoon drives precipitation patterns across the entire range. Heavy rain arrives on the southwest monsoon in June and persists until September. Darjeeling receives as much as 3800 millimeters of rainfall during this period. Shimla in the west gets only 1200 millimeters for the same months. The northern side known as Tibetan Himalaya is dry, cold, and windswept. It has a cold desert climate with sparse vegetation. Winters bring severe cold and most precipitation falls as snow. The leeward side receives less rain while well-exposed slopes get heavy rainfall. Rain shadows create near desert conditions in Upper Mustang sheltered by Annapurna and Dhaulagiri massifs. Pokhara on the southern side receives substantial rainfall annually. Temperatures fall by 0.2 to 1.2 degrees Celsius for every 100 meters rise in altitude. This creates climates ranging from nearly tropical foothills to tundra zones. The monsoon can cause major landslides that restrict tourism. Trekking seasons are limited to April or May before rains begin, or October and November after they end. Five distinct seasons exist in Nepal and Sikkim: summer, monsoon, autumn, winter, and spring.
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Common questions
When did the Himalayas begin forming?
The Himalayas began forming 70 million years ago when the Indian tectonic plate collided with the Eurasian plate. This massive geological event pushed the oceanic crust of India under the Asian continent.
How many glaciers cover the Himalayan range and how much fresh water do they store?
More than 15,000 glaciers cover the Himalayan range, storing approximately 3600 to 4400 gigatons of fresh water. Scientists refer to this region as the Third Pole because it holds the third-largest deposit of ice and snow on Earth after Antarctica and the Arctic.
Which countries does the Himalayan range cross territories of?
The Himalayan range crosses territories of five countries: Nepal, India, China, Bhutan, and Pakistan. More than 100 peaks exceed elevations of 7200 meters above sea level within these borders.
What is the highest known tree species in the Himalayas and at what elevation does it grow?
The highest known tree species is Juniperus tibetica located at 4800 meters in Southeastern Tibet. Temperatures fall by 2.0 degrees Celsius for every 1000 meters of altitude gain.
When does the Southwest Monsoon drive precipitation patterns across the entire range?
Heavy rain arrives on the southwest monsoon in June and persists until September. Darjeeling receives as much as 3800 millimeters of rainfall during this period.