The Himalayas

The Himalayas are the greatest mountain system in Asia and one of the planet’s youngest mountain ranges, that extends for more than 2,400km across the nations of Bhutan, China, India, Nepal, and Pakistan. The term ‘Himalaya’ literally means the ‘Abode of Snow’ and has been derived from a combination of two Sanskrit words, ‘Hima’ which means ‘snow’ and ‘Alaya’ which means ‘Abode’. The Himalayas act as a mighty barrier between the Tibetan Plateau in the north and the Indian subcontinent in the south. Some of the highest peaks in the world are located in the Himalayas, including Mount Everest, Kangchenjunga, Lhotse, Makalu, Cho Oyu, etc.

Geography Of The Himalayas

The Himalayas are considered as the world’s youngest, tallest, and most populated mountain systems. The Himalayas are bounded by the Tibetan Plateau in the north; the 800km long Hindu Kush and 500km long Karakoram Mountain ranges in the northwest; and by the vast Indo-Gangetic Plains in the south. The mighty Himalayan Mountain Range covers an area of about 595,000 sq. km and its maximum width varies between 150 to 350km. The major portion of the Himalayan Mountain Range is occupied by the countries of Nepal, Bhutan, and India, though some parts of this massive mountain range are also occupied by China as well as by Pakistan.

The Himalayan Mountains consist of a series of parallel ranges, including the Tibetan Himalayas, Greater Himalayas, Lesser Himalayas, and Siwalik ranges. These mountains are categorized into three regions—Western, Central, and Eastern Himalayas—from west to east. Often referred to as the “Third Pole,” the Himalayas hold the third-largest ice and snow deposit on Earth, following the Arctic and Antarctic. There are over 15,000 glaciers in the Himalayas, among them the Gangotri, Khumbu, Langtang, Yamunotri, and Zemu glaciers.

The glaciers of the Himalayan Mountains store more than 12,000 cubic kilometers of freshwater and are the source of some of the major rivers including the Brahmaputra, Ganges, Indus, Yamuna, etc. Many lakes are found in the Himalayan region including the Pangong Lake, Tilicho Lake, Gurudongmar Lake, She-Phoksundo Lake, Manasarovar Lake, Tsongmo Lake, etc. At present, at least 53 million people reside in the Himalayan region.

Geology Of The Himalayas

It is believed that over the past 65 million years, several worldwide plate-tectonic events have led to the movement of the Earth’s crust to form a vast number of mountain ranges. About 201 to 145 million years ago, during the Jurassic Period, the entire southern fringe of Eurasia was bordered by the Tethys Ocean. The Gondwana supercontinent began to break up about 180 million years ago, and the Indo-Australian Plate began to move in the northeastward direction towards the Eurasian Plate. This fast-moving Indo-Australian Plate started gradually compressing the Tethys Sea. The increased compressive forces led to the upliftment of the masses of rocks from the deep depths. The Indo-Australian Plate eventually collided with the Eurasian Plate between 40 and 50 million years ago. In due course, the Tethys Sea completely narrowed and its sea bottom was pushed upwards by the subducting Indo-Australian Plate, leading to the formation of the Tibetan Plateau and the mighty Himalayan Mountain ranges. Geologists believe that the Indo-Australian Plate is still being continuously forced underneath the Tibetan Plateau, which is leading to the rise of the Tibetan Plateau and the Himalayas at a rate of 5mm per annum. For this reason, the Himalayan region remains ‘geologically active’ and is highly prone to earthquakes, and other natural disasters from time to time.

Climate

The Himalayan Mountains have a profound impact on the climate of the entire Indian subcontinent. This mountain range serves as a substantial climatic shield, blocking cold, dry winds from the north and keeping them from reaching the Indian plains. Additionally, the Himalayas obstruct the southwest monsoons, preventing their passage to the northern side, which results in significant rainfall on the Indian side of the range. In the Indian Himalayas, the average annual temperature varies from -30°C to 25°C, while annual precipitation ranges from 1,500mm to over 4,800mm.

Ecology Of The Himalayas

The massive Himalayan Mountain Range is home to several exotic flora and fauna. At altitudes between 3,000m to 5,000m, alpine shrubs and meadows are found. The lower shrublands are covered by rhododendrons, while the alpine meadows support a wide range of flora during the warm season. Juniperus tibetica is the highest known tree species in the Himalayas that grow at an elevation of 4,900m in the southeastern part of Tibet. At elevations of 2,500m to 4,000m, temperate sub-alpine coniferous forests are found. Fir, pine, hemlock, and spruce are the dominant trees in the area. In the middle elevations of 2,000m to 3,000m, broadleaf and coniferous forests are found. In addition to this, plants like orchids, ferns, oaks, and maple also grow in the area. The lower elevations are dominated by the subtropical broadleaf forests.

The Himalayan Mountains support a rich faunal wealth. Several studies have revealed that the Indian Himalayas supports over 280 species of mammals, 940 species of birds, 200 species of reptiles, 80 species of amphibians, and 316 species of fish. Some of the notable animals that are found in the Himalayan region include snow leopards, Pygmy Hog, Gee’s golden langur, Himalayan musk deer, Namdapha flying squirrel, Asian black bear, Himalayan serow, Himalayan blue sheep, Himalayan tahr, red panda, Kashmir gray langur, and many more.

Of the 940 avian species, 39 are endemic to the Himalayan region. Some of the significant birds that are found here include the Indian Spotted eagle, Black-necked crane, white-bellied heron, etc. Situated at the junction of three important biogeographical realms, the Eastern Himalayas serve as a biodiversity hotspot and support exceptionally rich biodiversity with high endemism and numerous globally threatened species. There are about 107 protected areas in the Indian Himalayas, of which there are 20 National Parks, 5 Tiger reserves, 71 wildlife sanctuaries, 7 Ramsar sites, and 4 biosphere reserves.

Tourism And Threats

The breathtaking natural beauty and unique biodiversity of the Himalayan Mountains draw countless tourists globally, supporting the local tourism industry and boosting the regional economy. Additionally, the Himalayan Mountain Range is regarded as sacred by many followers of various religions, including Jainism, Buddhism, Sikhism, and Hinduism.

Recently, global warming and human-induced climate change have significantly impacted the entire Himalayan region. The rise in temperatures has caused glaciers to melt, disrupting the hydrological patterns of the area. Furthermore, the biodiversity of this mountainous ecosystem is at risk due to pollution, deforestation, habitat degradation and fragmentation, overexploitation of natural resources, the spread of invasive species, hunting, poaching of wildlife, and increasing human-animal conflicts.