Western Ghats (Sahyadri)

The Western Ghats, known in Sanskrit and Marathi tradition as the Sahyadri ("benevolent mountains"), form a roughly 1,600-kilometre escarpment that runs parallel to the western coast of peninsular India, from the Tapi river valley near the Gujarat–Maharashtra border in the north to Marunthuvazh Malai near Kanyakumari in Tamil Nadu in the south. Geologically, the Ghats are not a true folded mountain range but the uplifted, dissected western edge of the Deccan plateau, a block-faulted escarpment formed when the Indian plate rifted from Madagascar and the western margin subsided into the Arabian Sea during the Late Cretaceous and early Palaeogene. The northern third is built largely of Deccan Trap basalt laid down by the Cretaceous–Palaeogene volcanic eruptions, while the southern sections from Karnataka to Tamil Nadu expose far older Archaean granites, gneisses and charnockites. The range covers approximately 160,000 square kilometres across the states of Gujarat, Maharashtra, Goa, Karnataka, Kerala and Tamil Nadu.

The Ghats are conventionally segmented for study into northern, central and southern divisions, each with distinct topographic character. The northern Sahyadri in Maharashtra and Goa is the basalt country of flat-topped plateaus, stepped lava terraces and steep western scarps, rising to Kalsubai (1,646 metres), the highest peak in Maharashtra. South of the Palghat Gap (Palakkad Gap), a roughly 30-kilometre structural break separating the Nilgiris from the Anaimalai Hills, the southern Ghats attain their greatest elevations. Anamudi in Kerala's Anaimalai (Eravikulam) range, at 2,695 metres, is the highest point in India south of the Himalayas. Other key massifs include the Nilgiri Hills, where the Western and Eastern Ghats converge near Ootacamund, the Anaimalai and Cardamom (Elamalai) Hills, and the Agasthyamalai range at the southern terminus.

The hydrological significance of the Ghats is foundational to peninsular India. The crest line acts as a continental watershed: short, swift, west-flowing rivers descend the steep scarp to the Arabian Sea, while the major peninsular rivers rise on the Ghats and flow east across the Deccan to the Bay of Bengal. The Godavari, Krishna, Kaveri (Cauvery) and Tungabhadra all originate in or near the Sahyadri — the Godavari at Trimbak near Nashik, the Krishna at Mahabaleshwar, and the Kaveri at Talakaveri in Karnataka's Brahmagiri hills. The Ghats intercept the southwest monsoon, forcing orographic rainfall that exceeds 6,000 millimetres annually on the windward slopes (Agumbe and Mahabaleshwar are among India's wettest places) while casting a pronounced rain shadow over the Deccan interior. Mountain passes such as the Thal Ghat, Bhor Ghat, Pal Ghat and Sinhagad have carried road and rail traffic between the Konkan coast and the interior since pre-colonial times.

The Western Ghats were designated a UNESCO World Heritage Site in 2012, with 39 serial component sites across the four southern states, and the range is recognised as one of the world's eight "hottest" biodiversity hotspots under Conservation International's framework. The Madhav Gadgil-chaired Western Ghats Ecology Expert Panel (WGEEP) submitted its report in 2011, recommending that the entire range be treated as an Ecologically Sensitive Area with graded zoning; the subsequent Kasturirangan High-Level Working Group report of 2013 narrowed the proposed Ecologically Sensitive Area to roughly 37 percent of the range. Successive draft notifications by the Ministry of Environment, Forest and Climate Change between 2014 and the 2020s have repeatedly stalled amid opposition from Kerala, Karnataka and Maharashtra state governments and plantation interests, leaving the ESA boundaries legally unsettled.

The Western Ghats are frequently contrasted with the Eastern Ghats, and the distinction is a recurring examination point. The Western Ghats are higher, continuous, and structurally a faulted escarpment receiving heavy monsoon rainfall; the Eastern Ghats are lower, older, discontinuous, dissected by the deltas of the east-flowing rivers, and far drier. The two ranges meet at the Nilgiri Hills. The Ghats are also distinct from the Deccan plateau they bound — they are the plateau's raised rim rather than a separate orogenic belt — and from the Himalayas, which are young fold mountains of the Cenozoic collision, whereas the Sahyadri is a passive-margin escarpment of far greater antiquity in its basement rocks.

Contemporary controversy centres on ecological fragility against developmental pressure. The catastrophic Kerala floods of 2018, the recurrent landslides in Wayanad culminating in the deadly Chooralmala–Mundakkai disaster of July 2024, and the 2021 landslides in Maharashtra's Raigad district have intensified debate over quarrying, hill-cutting, monoculture plantations and unregulated tourism construction on unstable slopes. The Ghats harbour high endemism — the lion-tailed macaque, Nilgiri tahr, Malabar civet and numerous amphibians found nowhere else — and the shola–grassland mosaic of the high southern hills is among India's most threatened ecosystems. Wind-farm expansion, hydroelectric projects and proposed railway and highway alignments through forest corridors continue to test the unresolved ESA regime.

For the civil-services aspirant and the working policy practitioner, the Western Ghats sit at the intersection of physical geography, biodiversity governance, water security and centre–state federal friction. Mastery of the range requires holding several layers simultaneously: its block-faulted origin and basalt-to-charnockite geology, the Palghat Gap and the peak hierarchy from Anamudi to Kalsubai, its role as the source watershed of the Godavari–Krishna–Kaveri systems, and the live policy contest between the Gadgil and Kasturirangan visions of ecological protection. Few single geographic features so densely connect GS1 physical geography, GS3 environment and disaster management, and the constitutional politics of land and forest regulation.