Eastern Ghats

Eastern Ghats
Name	Eastern Ghats
Country	India
Highest	Gmajela (placeholder)

Eastern Ghats are a discontinuous chain of low to medium-height mountain ranges along the eastern coast of India, running through multiple states and adjoining diverse plains and plateaus. The ranges form a complex orogenic collage that influences regional rivers, climates, and human settlement patterns, and they host numerous protected areas, indigenous communities, and mineral deposits. Scholarly work on the ranges connects research institutions, conservation organizations, and state agencies across India, linking field studies at universities and geological surveys.

Geology and Tectonic History

The ranges record Precambrian to Mesozoic tectonics studied by the Geological Survey of India, researchers at Indian Institute of Science, and teams from University of Cambridge, Massachusetts Institute of Technology, and Tata Institute of Fundamental Research who mapped metamorphic belts, granulite facies, and shear zones. Key lithologies include charnockite, granite, gneiss, khondalite, and schist, analogous to suites described in the Bastar Craton, Dharwar Craton, and the Aravalli Range; plate reconstructions reference the breakup of Gondwana and the assembly of Laurentia and Banded Iron Formation-bearing cratons. Orogenic episodes associated with the Proterozoic and later reworking during the Cretaceous are inferred from radiometric ages obtained at the Physical Research Laboratory and international isotope laboratories. Fault systems and shear zones tie into regional stress fields analyzed in comparative studies with the Himalayas and the Western Ghats. Paleogeographic models integrate data from the Indian Ocean basin, the Bay of Bengal, and offshore seismic profiles.

Geography and Major Ranges

The ranges traverse states such as Odisha, Andhra Pradesh, Telangana, Tamil Nadu, Karnataka and marginally touch Chhattisgarh, interleaving with the Deccan Plateau and the Coromandel Coast. Principal subsections include the Araku Valley hills, the Nallamala Hills, the Nellore Plains uplands, the Singareni coal belt margins, and the Tamil Nadu hill tracts near Shevaroy Hills and Javadi Hills. Prominent passes and escarpments connect to transport arteries like the National Highway 16 corridor and rail links serving junctions such as Vijayawada, Visakhapatnam, and Chennai. Isolated inselbergs and plateaus such as the Srikakulam highlands host archaeological sites linked to the Megalithic culture and trade routes towards Kalinga and Chera ports of antiquity.

Climate and Hydrology

Monsoonal dynamics driven by the Southwest Monsoon and Northeast Monsoon create spatially variable precipitation regimes studied by the India Meteorological Department and climatologists at Indian Institute of Tropical Meteorology. Orographic effects yield rainshadow zones adjacent to the ranges and modulate runoff into major river systems including tributaries of the Godavari, Krishna, Mahanadi, and Cauvery. Catchments host reservoirs such as Srisailam, Nagarjuna Sagar, and smaller irrigation projects administered by state water boards and agencies like the Central Water Commission. Groundwater aquifers and springs in the hills support tribal hamlets and urban supply systems for cities like Visakhapatnam; hydrological studies reference work by the National Institute of Hydrology and international partners on watershed management and sediment transport to the Bay of Bengal.

Biodiversity and Ecosystems

Flora and fauna include endemic and range-restricted taxa documented by the Botanical Survey of India, Zoological Survey of India, and institutions such as the Centre for Cellular and Molecular Biology and Wildlife Institute of India. Vegetation types range from tropical dry deciduous forests to moist deciduous patches, with significant sal, teak, bambusa, and evergreen relic pockets comparable to assemblages in the Simlipal and Bhadra reserves. Faunal communities support species such as the Indian elephant, tiger, gaur, and endemic amphibians and reptiles recorded in peer-reviewed studies from Centre for Wildlife Studies. Protected areas including Kambalakonda Wildlife Sanctuary, Kinnerasani Wildlife Sanctuary, and Annamayya-adjacent reserves form part of conservation networks linked to the National Biodiversity Authority and international conventions like the Convention on Biological Diversity.

Human History and Cultural Significance

Archaeological evidence and historical records trace human occupation through Paleolithic tool sites, Iron Age settlements, and medieval polities such as Kalinga, Satavahana, Chola, and Vijayanagara Empire interactions that used the ranges for defense and resources. Indigenous communities including the Gond, Koya, Kondh, and Irula have cultural practices, oral histories, and land-use systems preserved in ethnographic work by the Anthropological Survey of India and university departments at University of Hyderabad and Madras University. Colonial-era mapping by the East India Company and administrative studies in the Imperial Gazetteer shaped modern forest policies and later legal frameworks adjudicated at institutions like the Supreme Court of India. Sacred groves, tribal festivals, cave art, and temple complexes near hill temples connect to broader networks of pilgrimage to sites in Tirupati and other historic shrines.

Economy, Resources, and Land Use

The ranges underpin mining for minerals such as bauxite, iron ore, and coal with operations by corporations like NMDC, Vedanta Resources, and regional cooperatives, subject to regulation by the Ministry of Mines and environmental clearances overseen by the Ministry of Environment, Forest and Climate Change. Agriculture on hill slopes, shifting cultivation, and plantation crops interface with irrigation schemes and development programs run by state rural departments and agencies like the National Rural Employment Guarantee Act implementation units. Forestry, ecotourism, and biodiversity offsets involve NGOs such as WWF-India and Conservation International partnering with state forest departments and international donors. Conflicts over land rights, mineral leases, and conservation have been adjudicated in cases brought before the National Green Tribunal and documented by human-rights groups and research centers including Centre for Science and Environment.

Category:Mountain ranges of India