Mountains

A great arc of mountains, composed of the Himalaya, Hindu Kush, and Patkai ranges, define the Indian subcontinent. These mountains were formed by the ongoing tectonic collision of the Indian Plate with the Eurasian Plate which started some 50 million years ago. These mountain ranges are home to some of the tallest mountains in the world and provide a natural barrier against the cold polar winds.

They also facilitate the monsoons that drive climate in India. The numerous rivers that originate in these mountains provide water to the fertile Indo-Gangetic plains. These mountains are recognised by biogeographers as the boundary between two of the earth’s great ecozones; the temperate Palearctic that covers most of Eurasia, and the tropical and subtropical Indomalaya ecozone that includes the Indian subcontinent and extend into Southeast Asia and Indonesia. Historically, these ranges have served as barriers to invaders.

India has seven major mountain ranges having peaks of over 1,000 m (3,300 feet). The Himalayas are the only mountain ranges to have snow-capped peaks. These ranges are:
Aravalli
Eastern Ghats
Himalayas
Patkai
Vindhyas
Sahyadri or Western Ghats
Satpuras

The Himalaya mountain range is the world’s highest mountain range. They form India’s north-eastern border, separating it from the rest of Asia. The Himalayas are one of the world’s youngest mountain ranges, and extend almost uninterrupted for a distance of 2,500 km (1,550 miles), covering an area of 500,000 km² (193,000 square miles).

The Himalayas extend from the state of Jammu and Kashmir in the west to the state of Arunachal Pradesh in the east. These states along with Himachal Pradesh, Uttaranchal, and Sikkim lie mostly in the Himalayan region. Some of the Himalayan peaks range over 7,000 m (23,000 feet) and the snow line ranges between 6,000 m (19,600 feet) in Sikkim to around 3,000 m (9,850 feet) in Kashmir. Kanchenjunga, which lies in Sikkim, is the highest point in the country’s territory (undisputed). Most peaks in the Himalayas remain snowbound throughout the year.

The Shiwalik, or lower Himalaya, consists of smaller hills towards the Indian side. Most of the rock formations are young and highly unstable, with landslides being a regular phenomenon during the rainy season. Many of India’s hill stations are located on this range. The climate varies from sub tropical in the foothills to tundra at the higher elevations of these mountain ranges.

The mountains on India’s eastern border with Myanmar are called as the Patkai or the Purvanchal. They were created by the same tectonic processes that resulted in the formation of the Himalaya. The features of the Patkai ranges are conical peaks, steep slopes and deep valleys. The Patkai ranges are not as rugged or tall as the Himalayas. There are three hill ranges that come under the Patkai: The Patkai-Bum, the Garo-Khasi-Jaintia, and the Lushai hills. The Garo-Khasi range is in the Indian state of Meghalaya. The climate ranges from temperate to alpine due to altitude. Cherrapunji, which lies on the windward side of these hills, has the distinction of being the wettest place in the world, receiving the highest annual rainfall .