UNESCO Inscribed the Western Ghats on 1 July 2012 as 39 Sites in Seven Clusters, Holding 352 Endemic Tree Species, 325 Globally Threatened Species and the Barrier That Intercepts the Monsoon

UNESCO’s World Heritage Committee inscribed the Western Ghats on Sunday 1 July 2012, at its 36th session in Saint Petersburg, as one property made of 39 component sites in seven clusters. The sites cover 795,315 hectares across four states, Kerala, Karnataka, Tamil Nadu and Maharashtra, and the listing rests on two natural criteria, (ix) and (x). UNESCO’s statement describes the range as a chain of mountains about 1,600 km long, broken only by the 30 km Palghat Gap near 11 degrees north.

What the Committee wrote about the mountains

Criterion (ix) is about how species arose. The statement says the region shows speciation tied to three events: the break-up of the ancient landmass Gondwanaland in the early Jurassic, India becoming an isolated landmass, and India’s later collision with Eurasia. It calls the Ghats an “Evolutionary Ecotone” (a meeting zone between two sets of species) that illustrates the “Out of Africa” and “Out of Asia” hypotheses on how species spread.

Criterion (x) is about the living stock. The Committee wrote that the Ghats contain “exceptional levels of plant and animal diversity and endemicity for a continental area.” Endemic means found nowhere else. The statement also says the mountains are older than the Himalaya and are recognised, along with Sri Lanka, as one of the world’s eight “hottest hotspots” of biological diversity.

Seven clusters from the far south to the Sahyadri

IUCN, the Committee’s adviser on natural sites, lists the clusters, with 2010 nomination data, in an annex to its 2012 evaluation. Agasthyamalai lies in the far south, then come Periyar, Anamalai, Nilgiri, Talacauvery, Kudremukh and Sahyadri in the north. The components include Silent Valley National Park, Periyar Tiger Reserve, Eravikulam National Park, Kudremukh National Park, Koyna Wildlife Sanctuary and the Kas Plateau. Most of the 39 sit in Kerala and Karnataka, whose Kerala and Karnataka profiles cover the states themselves. IUCN notes that the 2012 maps adjusted the boundaries of 11 components to leave out settlements and parts of reservoirs.

UNESCO gives the reason for a serial property: species composition changes so much along the 1,600 km that no single site could tell the story. About 40 percent of the property lies outside the formal protected-area system, mostly in Reserved Forests, which the statement calls legally protected.

Sources measure the range differently. UNESCO gives around 140,000 sq km. The Gadgil panel of 2011 worked on 129,037 sq km. The High Level Working Group of 2013 defined the region as 188 talukas (sub-districts) in six states and got 164,280 sq km. The India Meteorological Department’s monsoon FAQ describes the Ghats as approximately 1,000 km long and 200 km broad. Each figure follows its own definition.

The species counts UNESCO gives

The statement records 4,000 to 5,000 plant species. Of nearly 650 tree species, it says, 352 (54 percent) are endemic. Amphibians number up to 179 species, 65 percent endemic. Reptiles number 157 species, 62 percent endemic, and freshwater fishes 219 species, 53 percent endemic. About 80 percent of tiger beetles are endemic.

At least 325 species on the IUCN Red List of threatened species occur in the Ghats: 129 Vulnerable, 145 Endangered and 51 Critically Endangered. By group, UNESCO lists 229 plants, 31 mammals, 15 birds, 43 amphibians, 5 reptiles and 1 fish. Those group figures add up to 324, one short of the headline, and the statement does not explain the gap.

UNESCO says parts of the single largest population of globally threatened species that range over wide areas, such as the Asian elephant, gaur and tiger, occur in the property. The lion-tailed macaque, Nilgiri tahr and Nilgiri langur are unique to the area. Britannica adds that the Ghats hold more than 30 percent of India’s plant, fish, bird and mammal species, about 17 percent of the world’s tigers and about 30 percent of its Asian elephants. Our pieces on the elephant census and the tiger count give the surveys behind those animals.

The barrier that intercepts the monsoon

UNESCO’s statement says the mountains and their montane forests influence the Indian monsoon, and that the Ghats act as a key barrier that intercepts the rain-laden south-west winds of late summer. It calls the property “one of the best examples of the tropical monsoon system on the planet.”

Britannica describes the range as peninsular India’s principal watershed. It says the Ghats trap the moisture of winds from the Arabian Sea, producing a tropical monsoon climate along the narrow western coast and depriving the Deccan of significant rainfall. The Krishna, Godavari and Kaveri rivers rise there.

The IMD adds a detail from its FAQ. A shallow trough of low pressure forms along the west coast between north Kerala and south Gujarat, and IMD says it strengthens the coastal rain. When the winds lack the energy to climb the Ghats, they are deflected, and the return current forms an offshore vortex that IMD links to heavy to very heavy rain on the coast. Silent Valley shows the range of totals. A PIB feature gives mean annual rainfall of over 5,000 mm in the western Neelikkal area and about 3,200 mm on the eastern side of the park, with 80 percent falling from June to September. The workings of the season are in our monsoon explainer.

Who protects it

The components are tiger reserves, national parks, wildlife sanctuaries and reserved forests, all owned by the states. UNESCO’s statement lists the Wildlife (Protection) Act 1972, the Indian Forest Act 1927 and the Forest Conservation Act 1980 as their legal cover, and puts them under the Forest Departments and the Chief Wildlife Wardens. Each component runs on an approved management or working plan. A Western Ghats Natural Heritage Management Committee under the Environment Ministry coordinates across states. Livelihood concerns are regulated by the Forest Rights Act 2006, and local participation runs through Village Ecodevelopment Committees. IUCN says the Ghats include two biosphere reserves, the Nilgiri at 11,040 sq km and the Agasthyamalai at 3,500 sq km.

Silent Valley is the best-documented case. A PIB feature records that the Kerala State Electricity Board announced a dam there in 1976, that the project was abandoned in 1983, that the park was dedicated to the nation on 7 September 1985 and that it became the core of the Nilgiri Biosphere Reserve on 1 September 1986. Its core of about 89.52 sq km is described as home to the largest population of lion-tailed macaques.

The listing took two sessions. In 2011 the Committee referred the nomination back to India, asking it to take account of the Western Ghats Ecology Expert Panel and to improve coordination. In 2012 IUCN again recommended deferral. The Committee inscribed the property, commended India’s efforts on protection and coordination, and asked for four things: attention to scientific studies, tourism kept within capacity, prior impact assessment of infrastructure, and an overarching management plan for all 39 components.

IUCN’s World Heritage Outlook, in its assessment dated 11 October 2025, rates the outlook “significant concern” and says no State of Conservation report or overall management plan had been submitted to report progress on those requests. India’s own 2023 periodic report says each component has a management plan while coordination across the whole site is inadequate, names high-volume pilgrimage tourism as a major factor, and calls the budget acceptable but open to improvement. In 2017 the Committee declined a proposed minor change to the boundaries and invited India to submit a new nomination for a significant boundary modification. IUCN’s 2025 assessment says proposals to extend the property offer good potential to improve connectivity.

From the Gadgil panel to the seventh draft

The ministry’s Western Ghats Ecology Expert Panel, chaired by Madhav Gadgil, submitted its report on 31 August 2011. It designated the entire Ghats an ecologically sensitive area in three grades, ESZ1 to ESZ3, and recommended no new large-storage dams in the top grade. A High Level Working Group chaired by K. Kasturirangan reported on 15 April 2013. It found about 41 percent of the region still natural land and about 60 percent under settlements, farms and plantations, and it proposed 59,940 sq km, about 37 percent, as the sensitive area. That area includes 4,156 villages, and the group put the region’s population at about 50 million.

The Environment Ministry accepted the working group’s report “in principle” with stipulations. PIB reports that from 17 April 2013 no environmental clearance would be considered in the proposed area for five categories: mining, quarrying and sand mining; thermal power plants; buildings of 20,000 sq m or more; townships of 50 hectares or more; and red-category (polluting) industries. A draft notification followed on 10 March 2014. A fresh draft of 4 September 2015 superseded it after states and stakeholders raised concerns, and the ministry said the lives, farms and plantations of the roughly 50 million residents would not be adversely affected. The ministry told the Lok Sabha on 31 July 2023 that the draft had been re-notified for the fifth time on 6 July 2022, with validity to 30 June 2024.

The Wire reports that the sixth draft, dated 31 July 2024, expired on 27 July 2026 and the ministry issued a seventh the same day. It proposes 56,825.7 sq km: Karnataka 20,668, Maharashtra 17,340, Kerala 9,993.7, Tamil Nadu 6,914, Goa 1,461 and Gujarat 449. Down To Earth reports that Karnataka’s legislature rejected the draft on 22 September and asked for a year of field surveys, that Kerala has asked to cut its share to 8,590.69 sq km, and that Maharashtra and Goa have sought exclusions. The 60-day objection period has ended, and the expert committee examining the objections has been extended to July 2027.