The Western Ghats, also called the Sahyadri, run about 1,600 km down the western edge of peninsular India from southern Gujarat to near Kanyakumari. Though their highest peak, Anamudi, reaches only 2,695 m, they are a UNESCO World Heritage Site and one of the world's eight "hottest" biodiversity hotspots — and they drive the Indian summer monsoon that feeds most of southern India.
Geography and Extent
Fly down India's western coast and the structure is unmistakable: a narrow, extremely wet coastal plain (the Konkan in the north, the Malabar in the south), then an abrupt wall of hills, then the much drier Deccan Plateau stretching east. That wall is the Western Ghats.
The range runs roughly 1,600 km from the Tapti River in southern Gujarat, south through Maharashtra, Goa, Karnataka, Kerala, and Tamil Nadu. Its width varies between about 30 and 100 km. Geographers conventionally divide it into three sections:
- Northern Ghats — Maharashtra and Goa, built on the layered basalt plateaus of the Deccan Traps, with the classic flat-topped, stepped profile.
- Central Ghats — Karnataka, including the Baba Budan range and the Kudremukh massif.
- Southern Ghats — Kerala and Tamil Nadu, comprising the Nilgiri, Anamalai, Cardamom, and Agasthyamala hills, and containing the highest summits.
The Palghat Gap
The single most important break in the range is the Palghat (Palakkad) Gap, a roughly 30 km-wide breach separating the Nilgiri hills from the Anamalai hills. It is the only easy land route between Kerala and Tamil Nadu, and it has carried trade, armies, railways, and highways for centuries. It also matters ecologically: the gap is a genuine biogeographic barrier, and a number of species found north of it are absent to the south, and vice versa.
Every major peninsular Indian river rises in the Western Ghats — the Godavari, Krishna, Kaveri, Vaigai, and Periyar among them. The range intercepts something on the order of a third of India's rainfall before it can reach the Deccan interior.
Geology and Formation
The Western Ghats are commonly mistaken for a fold mountain range like the Alps or the Himalayas. They are not. They are the uplifted, eroded edge of the Deccan Plateau — an escarpment rather than a collision range.
Their origin lies in the breakup of Gondwana, when the Indian subcontinent rifted away from Madagascar and the Seychelles between roughly 100 and 65 million years ago. The rifted margin was uplifted, and erosion has since carved back the scarp face. The northern third of the range is dominated by the Deccan Traps, one of the largest volcanic provinces on Earth, erupted around the Cretaceous–Paleogene boundary about 66 million years ago and often discussed as a contributing factor in the end-Cretaceous mass extinction. Further south, the Ghats expose far older Precambrian gneisses and granites of the Indian craton.
This matters for one striking reason: the Western Ghats are vastly older than the Himalayas, and that antiquity is written into their wildlife. Several frog and caecilian lineages here are evolutionary relicts of Gondwana, with closest relatives in Africa, Madagascar, and the Seychelles.
Highest peaks
- Anamudi — 2,695 m, Kerala (Eravikulam). Highest point in the Western Ghats and in peninsular India.
- Doddabetta — 2,637 m, Tamil Nadu (Nilgiris).
- Mukurthi Peak — 2,554 m, Tamil Nadu (Nilgiris).
- Kudremukh — 1,894 m, Karnataka.
- Kalsubai — 1,646 m, the highest point in Maharashtra.
The Monsoon Engine
The Western Ghats are not merely rained on by the monsoon; they are a working part of it. From June through September, southwesterly winds carry enormous quantities of moisture off the Arabian Sea and slam into the western flank of the range. Forced upward, the air cools, condenses, and unloads.
The resulting totals are extraordinary. Annual rainfall exceeds 7,000 mm at some Kerala stations, and Agumbe in Karnataka — often called the Cherrapunji of the South — records more than 11,000 mm in wet years, among the highest in mainland India. Cross to the eastern flank and the picture inverts completely: parts of the Deccan rain shadow receive under 700 mm. That gradient, from among the wettest places on Earth to semi-arid scrub within a few tens of kilometres, is what packs so many distinct ecosystems into such a narrow strip. Our explainer on how monsoons work covers the wider system.
Temperature varies with altitude rather than latitude here. The high Nilgiri and Anamalai plateaus can approach freezing on winter nights, while the coastal foothills a short drive away stay tropically warm year-round.
Flora, Fauna, and the Shola Ecosystem
UNESCO inscribed the Western Ghats in 2012, citing more than 7,400 plant species, 139 mammal species, 508 bird species, and 179 amphibian species — a remarkable share of them endemic.
Vegetation shifts with elevation, from tropical evergreen rainforest below about 1,500 m through moist deciduous forest to the distinctive shola-grassland mosaic above roughly 1,800 m. Sholas are compact patches of stunted evergreen forest tucked into valley folds and hollows, surrounded by open montane grassland on the exposed slopes and ridges. The pattern is not random: the forest survives where frost drains away and moisture collects. It is an ancient, slow-forming system, and once cleared for tea, eucalyptus, or wattle plantations it does not readily return.
Notable endemic and flagship species include the lion-tailed macaque, the Nilgiri tahr, the Nilgiri langur, and over 1,500 endemic plants. The range remains one of the last strongholds for the Asian elephant in southern India and supports tiger, leopard, gaur, sloth bear, and the dhole, or Asiatic wild dog.
Western Ghats vs Eastern Ghats: A Comparison
India's peninsula is flanked by two hill systems, and they are often assumed to be a matching pair. They are nothing of the sort.
- Continuity. The Western Ghats form a nearly unbroken escarpment for 1,600 km, interrupted meaningfully only at the Palghat Gap. The Eastern Ghats are a discontinuous, eroded chain of hill groups, cut through repeatedly by the major east-flowing rivers.
- Height. The Western Ghats average roughly 1,200 m with peaks near 2,700 m. The Eastern Ghats are considerably lower, generally 600 m or less, with Arma Konda in Andhra Pradesh reaching about 1,680 m.
- Rainfall. This is the sharpest contrast. The Western Ghats catch the full force of the southwest monsoon and can exceed 7,000 mm annually. The Eastern Ghats sit in that rain shadow and depend far more on the weaker northeast (retreating) monsoon, receiving on the order of 800–1,500 mm.
- Rivers. The Western Ghats are the watershed — the Godavari, Krishna, and Kaveri all rise there and flow east, straight across the Deccan and through gaps in the Eastern Ghats to the Bay of Bengal. The Eastern Ghats source comparatively few major rivers of their own.
- Biodiversity and protection. The Western Ghats are a globally recognised biodiversity hotspot with World Heritage status. The Eastern Ghats, though ecologically valuable and home to significant tribal populations, have far lower endemism and considerably weaker legal protection.
The asymmetry comes down to one fact of physical geography: the Western Ghats are a steep, continuous uplifted rift margin standing directly in the path of moisture-laden ocean winds, while the Eastern Ghats are the worn-down remains of much older fold structures, sitting downwind and thoroughly dissected by rivers.
People, Economy, and Conservation Pressure
The Ghats have shaped peninsular Indian life for millennia. Their passes — Goa, Tamhini, Bhor, and Palghat — structured trade between coast and interior across the Chola, Vijayanagara, Maratha, and colonial eras. In the 17th century the Maratha empire turned the steep Sahyadri escarpment into a fortress system, and hill forts such as Raigad, Pratapgad, Sinhagad, and Lohagad remain major heritage sites today. Under colonial rule, hill stations like Munnar and Coorg grew up around tea, coffee, and cardamom estates.
That economic role continues — spices, tea, hydropower from the Idukki, Koyna, and Sharavati schemes, and heavy tourism — and so does the tension it creates. The Gadgil report (2011) recommended treating almost the entire range as an ecologically sensitive area; the subsequent Kasturirangan report (2013) proposed a far smaller protected footprint of roughly 37%. Neither has been implemented in full, and the disagreement between them still frames every development dispute in the region. Landslides during exceptionally heavy monsoon seasons, worsened by slope cutting and quarrying, have added urgency to the argument.
Frequently Asked Questions
How long are the Western Ghats?
About 1,600 km, running from the Tapti River in southern Gujarat south to near Kanyakumari at India's southern tip.
Which Indian states do the Western Ghats cross?
Six: Gujarat (a small northern portion), Maharashtra, Goa, Karnataka, Kerala, and Tamil Nadu. The largest shares by area are in Karnataka and Kerala.
What is the highest peak in the Western Ghats?
Anamudi in Kerala, at 2,695 m. It is also the highest point anywhere in India south of the Himalayas.
Why are the Western Ghats a UNESCO World Heritage Site?
They were inscribed in 2012 for exceptional biodiversity and high endemism, including amphibian lineages of evolutionary significance dating back to the Gondwana supercontinent, alongside their role in the monsoon system.
Final Thoughts
The Western Ghats prove that a mountain range does not need great height to matter. At under 2,700 m they steer the Indian monsoon, source the rivers that irrigate the whole peninsula, and shelter evolutionary relicts from a supercontinent that broke apart before the dinosaurs died out. For anyone studying India's geography, no other range better demonstrates how a modest ridge of hills can determine the climate and agriculture of an entire subcontinent.
