Himalayan ranges

Story hook

On 3 April 1984, an Indian Army patrol of 30 men under Captain Sanjay Kulkarni of the 4 Kumaon Regiment trudged up to a desolate spot called Bilafond La in the Saltoro Ridge of the Karakoram at 5,450 m. They were the first soldiers in the world to claim, by physical occupation, the Siachen Glacier — the 70-km-long ice river that runs north-south at altitudes of 5,400-6,700 m. Operation Meghdoot, mounted by 79 paratroopers who choppered in three days earlier, had pre-empted a Pakistani operation by 17 days. Forty-two years later, Siachen remains the highest battlefield in the world, where India's troops face not the enemy but the cold — temperatures as low as -60°C kill more soldiers than Pakistani fire ever has.

Siachen sits in the Trans-Himalayan zone — the northernmost of the five Himalayan ranges that wall India off from Central Asia. K2 (8,611 m, Mt Godwin-Austen), the world's second highest peak, rises immediately to the west. The Trans-Himalaya is not even the most populated belt — that distinction goes to the Lesser Himalaya with its hill stations (Shimla, Mussoorie, Darjeeling). The Shivaliks, the southernmost outer range, are where most of India's Himalayan timber-belt towns sit. And the Purvanchal — the eastern hills of Nagaland, Mizoram, Manipur, Meghalaya — close the loop where the Brahmaputra makes its U-turn around Namcha Barwa.

This file walks through the five parallel range systems — their geology, their peaks, their passes, their hill stations, and their strategic significance.

Why this matters for UPSC

The Himalayan ranges have been a Prelims standard since 1979 — typically one to two questions per year on ranges, peaks, passes, or glaciers. Mains GS-I has asked "Distinguish among the five Himalayan ranges" (2014), "Examine the strategic significance of the Karakoram pass" (2018), and "How are Himalayan glaciers responding to climate change?" (2021). The Himalayas also drive India's monsoon (orographic uplift), river system (perennial snow-fed flow), and national defence (China + Pakistan borders) — a topic with maximum cross-syllabus utility.