Western & Eastern Ghats

Story hook

Stand on the west coast of India during the monsoon and look east, and you will see a near-unbroken green wall rising steeply from the plains — the Western Ghats, or Sahyadri. When the southwest monsoon sweeps in from the Arabian Sea, this wall forces the moist air violently upward; it cools, condenses, and dumps enormous rain on the western slopes — over 6,000 mm a year at Agumbe and Mahabaleshwar. Cross to the other side, just a few kilometres east, and you step into the rain shadow of the Deccan, where some districts get barely 600 mm. One mountain chain, two completely different worlds.

Now travel to the east coast. Here the Eastern Ghats are not a wall at all — they are a broken, eroded string of hills, sliced through again and again by the great peninsular rivers — the Mahanadi, Godavari, Krishna and Kaveri — on their way to the Bay of Bengal. The two ranges finally clasp hands in the south at the Nilgiri Hills, where the rounded blue mountains of Doddabetta mark the junction.

These two ranges are the rim of peninsular India — they decide where the rain falls, where the great rivers rise, and where some of the planet's richest biodiversity survives. The Western Ghats alone are one of the world's eight "hottest" biodiversity hotspots and a UNESCO World Heritage Site. Understanding the Ghats is understanding the skeleton and the lifeblood of the Indian peninsula.

Why this matters for UPSC

A high-frequency GS-I physical-geography topic that also feeds GS-III (environment, disasters). Prelims tests the contrast between the two ranges, the highest peaks (Anamudi, Doddabetta, Jindhagada), the gaps (Palghat), orographic rainfall and rain shadow, and which rivers rise where. Mains pairs it with biodiversity conservation (the Gadgil vs Kasturirangan debate), landslides (Wayanad 2024) and monsoon mechanism. It ties together drainage, climate and ecology in one feature.