Lakes of India
Lakes of India
India's lakes span freshwater and saline types, tectonic and glacial origins, crater formations, and coastal lagoons — from Ladakh's high-altitude salt lakes to Kerala's backwater lagoons and Maharashtra's meteorite-impact Lonar Lake. UPSC tests lake classifications, Ramsar designations, and conservation challenges. SSC/RRB exams ask about the largest freshwater lake (Wular), largest lagoon (Chilika), longest lake (Vembanad), crater lake (Lonar), and lake-state associations.
Key Dates
Largest freshwater lake in India (~130 sq km when flooded) — in J&K on the Jhelum River; Ramsar site
Largest coastal lagoon in India (~1,100 sq km) — Odisha; Ramsar site; Irrawaddy dolphins
Largest inland saline lake in India (~230 sq km) — Rajasthan; produces 8.7% of India's salt; Ramsar site
Longest lake in India (96.5 km) — Kerala; backwaters; Nehru Trophy Boat Race; Ramsar site
134 km long (60% in China) — highest-altitude saltwater lake at ~4,350 m; Ladakh; strategic border area
Largest freshwater lake in NE India — Manipur; floating phumdis; Keibul Lamjao NP; Ramsar site (Montreux)
Only crater lake formed by meteorite impact in basaltic rock — Maharashtra; ~50,000 years old; saline-alkaline
Iconic lake in Srinagar, J&K — houseboats, floating gardens (Rad); faces severe eutrophication
Classification of Indian Lakes
Indian lakes divide by water type and origin. By Water Type: (1) Freshwater — low dissolved salts; Wular (J&K), Dal (J&K), Loktak (Manipur), Bhimtal and Nainital (Uttarakhand). (2) Saline/Salt — high salt concentration from endorheic basins or coastal influence; Sambhar (Rajasthan), Pangong Tso (Ladakh), Tso Kar (Ladakh), Lonar (Maharashtra), Pulicat (TN-AP, brackish). (3) Brackish — intermediate salinity, typically coastal lagoons; Chilika (Odisha), Pulicat (TN-AP), Vembanad (Kerala, varies seasonally). By Origin: (1) Tectonic — crustal movements create depressions; Wular Lake occupies a tectonic basin; Kashmir Valley lakes share this origin. (2) Glacial — erosion forms cirque lakes/tarns, deposition creates moraine-dammed lakes; common above 3,500 m in the Himalayas; Gurudongmar (Sikkim, 5,430 m), Roopkund (Uttarakhand — "Mystery Lake" with ~600 ancient skeletons), Tsomgo/Changu (Sikkim). (3) Volcanic/Crater — Lonar Lake (Maharashtra) formed from a meteorite impact ~50,000 years ago in Deccan basalt — the only such lake in basaltic rock globally. (4) Lagoon/Coastal — bars or spits enclose bays; Chilika, Pulicat, Vembanad. (5) Oxbow — meander cutoffs in Ganga, Brahmaputra, and Mahanadi floodplains. (6) Man-made/Reservoirs — Gobind Sagar (Bhakra Dam, HP), Hirakud (Odisha), Nagarjuna Sagar (Telangana-AP), Indira Sagar (MP).
Major Freshwater Lakes of India
Key freshwater lakes span floodplains to glacial tarns. (1) Wular Lake — J&K, on the Jhelum River; India's largest freshwater lake (~130 sq km when flooded, shrinks in summer); tectonic origin; Ramsar site; absorbs floods and sustains thousands of fisherfolk; siltation, encroachment, and willow expansion have consumed about 30% of its area. (2) Dal Lake — Srinagar, J&K; ~18 sq km; known for houseboats and floating gardens ("Rad" — vegetables grown on reed mats); severe eutrophication, sewage inflow, and encroachment threaten it; connected to the Jhelum via Dalgate. (3) Loktak Lake — Manipur; largest freshwater lake in NE India (~287 sq km); floating phumdis (vegetation-soil masses) support Keibul Lamjao NP — the world's only floating national park and habitat of the endangered Sangai deer; Ramsar site on the Montreux Record due to degradation from the Ithai Barrage (1983). (4) Nainital Lake — Uttarakhand; tectonic lake at 1,938 m in the Kumaon Hills; crescent-shaped, ~1.5 km long. (5) Bhimtal — Kumaon's largest lake; holds an island at its centre. (6) Hussain Sagar — Hyderabad; man-made in 1562 by Ibrahim Quli Qutb Shah; links Hyderabad and Secunderabad; an 18 m Buddha statue stands on a monolithic rock in the lake. (7) Upper Lake (Bhoj Wetland) — Bhopal, MP; built in the 11th century by Raja Bhoj; Ramsar site. (8) Sukhna Lake — Chandigarh; man-made (1958) as part of Le Corbusier's city plan.
Saline and Brackish Lakes
India has significant saline and brackish water bodies: (1) Sambhar Lake — Rajasthan; India's largest inland saline lake (~230 sq km, varies seasonally); in a structural depression between the Aravalli Hills; receives water from seasonal rivers (Mendha, Samaod, Khari); no outflow — water evaporates leaving salt; produces about 8.7% of India's salt; Ramsar site; an important wintering ground for flamingos and other migratory birds; in November 2019, thousands of migratory birds died here due to avian botulism. (2) Pangong Tso — Ladakh; one of the most famous high-altitude lakes; about 134 km long and 5 km wide at the broadest; at an elevation of ~4,350 m; about 60% of the lake lies in China; saline-brackish; endorheic (no outflow); changes colour from blue to green to red depending on season and minerals; strategically sensitive — the 2020 India-China tensions involved areas near Pangong Tso; the Pangong Range runs parallel to the lake on the south. (3) Tso Moriri — Ladakh; at 4,522 m; about 28 km long; saline; Ramsar site; breeding ground for the bar-headed goose and great crested grebe; surrounded by the Changthang Plateau (home to the Changpa nomads who rear the Pashmina goat). (4) Tso Kar — Ladakh; at ~4,530 m; white encrustation of salt around its shores; historically an important source of salt for trade via the Karakoram Pass. (5) Pulicat Lake — on the AP-TN border; India's second-largest brackish water lagoon after Chilika (~759 sq km); connected to the Bay of Bengal; Pulicat Lake Bird Sanctuary; flamingo breeding site; historically the site of a Dutch trading post (Pulicat was the capital of Dutch Coromandel). (6) Lonar Lake — Buldhana district, Maharashtra; formed by a meteorite impact ~50,000 years ago; the only known crater lake in basaltic rock in the world; about 1.8 km diameter and 150 m depth; water is both saline and alkaline (pH ~10); supports unique extremophilic microorganisms; in 2020, the lake turned pink due to increased salinity and algal (Haloarchaea) activity. Declared a National Geo-heritage Monument.
Coastal Lagoons of India
Coastal lagoons are shallow water bodies separated from the ocean by a narrow barrier (spit, sandbar, or barrier island). India's major coastal lagoons: (1) Chilika Lake — Odisha; the largest coastal lagoon in India and the second-largest in the world (~1,100 sq km, varies between 900-1,165 sq km seasonally); connected to the Bay of Bengal by a narrow channel; receives water from the Mahanadi distributaries and other rivers; a unique ecosystem with freshwater, brackish, and marine zones; supports over 1 million migratory birds from as far as the Caspian Sea, Siberia, and Central Asia; designated India's first Ramsar site (1981); was on the Montreux Record (1993-2002) due to silting of the mouth; restored by opening a new artificial mouth channel in 2000; Irrawaddy dolphins (~150) found here; Nalabana Island Bird Sanctuary is within Chilika; supports the livelihood of about 200,000 fisher folk. (2) Vembanad Lake/Backwaters — Kerala; the longest lake in India (96.5 km) and one of the largest (2,033 sq km); part of the Kerala Backwater system — an intricate network of interconnected lagoons, canals, rivers, and inlets parallel to the coast; Ramsar site; Kumarakom Bird Sanctuary on its eastern shore; Nehru Trophy Boat Race (snake boat race) held annually on Vembanad; rice cultivation in Kuttanad (below sea level — one of the few places in the world where farming occurs below sea level); faces pollution, reclamation, and declining fish catches. (3) Ashtamudi Lake — Kerala; a multi-branched ("eight-armed") estuary; Ramsar site; Kollam district; major tourism and fisheries hub. (4) Kabar Taal (Kabar Lake) — Bihar; Asia's largest freshwater oxbow lake (Ramsar site); important for migratory birds.
Glacial and High-Altitude Lakes
The Himalayas host thousands of high-altitude lakes formed by glacial, tectonic, and volcanic processes: (1) Gurudongmar Lake — north Sikkim; at 5,430 m, one of the highest lakes in India; sacred to Buddhists and Sikhs; named after Guru Padmasambhava (Guru Rinpoche); partially frozen even in summer. (2) Tsomgo (Changu) Lake — east Sikkim; at 3,753 m; glacial lake; a sacred lake that changes colour with seasons; on the Nathu La road. (3) Roopkund — Uttarakhand; at 5,029 m; the "Skeleton Lake" or "Mystery Lake" — contains about 600-800 human skeletons dating to the 9th century, believed to be victims of a catastrophic hailstorm during a pilgrimage; a high-altitude glacial lake. (4) Satopanth Tal — Uttarakhand; at 4,600 m; near Badrinath; triangular-shaped glacial lake; sacred to Hindus (named after the Hindu Trinity). (5) Hemkund Sahib — Uttarakhand; at 4,632 m; glacial lake; the Sikh pilgrimage site of Hemkund Sahib Gurudwara is on its shore; mentioned in the Dasam Granth. (6) Pangong Tso — Ladakh; 134 km; discussed above. (7) Tso Moriri — Ladakh; discussed above. (8) Manasbal Lake — J&K; called the "Jewel of Kashmir"; deepest lake in Kashmir (13 m); renowned for lotus blooms. (9) Sheshnag Lake — J&K; at 3,590 m; on the Amarnath Yatra route; fed by glacial meltwater. (10) Bhrigu Lake — Himachal Pradesh; at 4,300 m; near Manali; sacred to sage Bhrigu. Many of these high-altitude lakes are of immense ecological importance as habitat for migratory and resident bird species, particularly the bar-headed goose, Brahiminy duck, black-necked crane (Tso Moriri), and great crested grebe.
Man-Made Lakes (Reservoirs)
India has thousands of man-made lakes and reservoirs created by damming rivers for irrigation, drinking water, hydropower, and flood control. Major reservoirs: (1) Gobind Sagar — Himachal Pradesh; formed by the Bhakra Dam (226 m, one of the highest gravity dams in the world) on the Satluj River; 168 sq km; the third-largest reservoir in India by capacity. (2) Hirakud Reservoir — Odisha; formed by the Hirakud Dam on the Mahanadi River; one of the longest dams in the world (25.8 km including dykes); reservoir area about 743 sq km; serves irrigation, flood control, and hydropower. (3) Nagarjuna Sagar — Telangana-AP; on the Krishna River; one of the world's largest masonry dams; reservoir area about 285 sq km; crucial for irrigation in both states. (4) Indira Sagar — Madhya Pradesh; on the Narmada River; one of the largest reservoirs in India by area (~913 sq km); part of the Narmada Valley Development Project. (5) Sardar Sarovar — Gujarat; on the Narmada River; a massive multipurpose dam; the Statue of Unity (182 m, world's tallest statue) stands near it. (6) Jaisamand Lake (Dhebar Lake) — Rajasthan; built by Maharana Jai Singh of Udaipur in 1685; was the largest artificial lake in Asia at the time; about 87 sq km. (7) Ukai Reservoir — Gujarat; on the Tapti River. (8) Stanley Reservoir — Tamil Nadu; formed by Mettur Dam on the Kaveri River (1934). (9) Almatti Reservoir — Karnataka; on the Krishna River. Tanks — thousands of traditional water harvesting structures, especially in South India (Tamil Nadu alone has about 39,000 tanks/eris); these man-made lakes serve irrigation, groundwater recharge, and community water supply; many have cultural significance (temple tanks).
Threats to Indian Lakes and Conservation
India's lakes face severe environmental challenges: (1) Eutrophication — nutrient enrichment from sewage and agricultural runoff causes algal blooms, oxygen depletion, and fish kills; Dal Lake, Nainital, Hussain Sagar, Ulsoor Lake (Bengaluru), and Bellandur Lake (Bengaluru — has caught fire multiple times due to extreme pollution) are severely eutrophic. (2) Encroachment — urban expansion and illegal construction on lake beds; Mumbai has lost almost all its natural lakes to development; Bengaluru has lost over 85% of its lakes in 50 years; Wetlands Rules 2017 aim to prevent this but enforcement is weak. (3) Siltation — accelerated erosion from deforested catchments increases sediment inflow; Wular Lake has lost about 30% of its area; many Himalayan lakes face similar threats. (4) Pollution — industrial effluents, untreated sewage, and solid waste; Hussain Sagar in Hyderabad receives 80+ million litres of sewage daily; Bellandur Lake in Bengaluru is India's most polluted lake; Ganga-fed floodplain lakes in Bihar and UP receive polluted river water. (5) Invasive Species — water hyacinth (Eichhornia crassipes) chokes numerous lakes, blocking sunlight and oxygen; Loktak Lake, Hussain Sagar, and many others are affected. (6) Mining — sand mining in and around lakes degrades ecosystems. Conservation efforts: National Lake Conservation Plan (now merged into NPCA); Ramsar designation provides international recognition and monitoring framework; NGT orders for specific lake protection (Bellandur, Yamuna floodplain lakes); AMRUT mission includes lake rejuvenation in urban areas; Atal Mission for Rejuvenation and Urban Transformation includes water body restoration; National Wetland Conservation Programme covers important lakes; state-level initiatives (e.g., "Lake Revitalization" in Rajasthan, "Jal Shakti Abhiyan" for water conservation).
Relevant Exams
Lakes of India is a consistently tested topic. UPSC asks about lake types (tectonic, glacial, crater), specific lakes and their features, Ramsar sites, and lake conservation challenges. SSC/RRB exams test factual recall — largest freshwater lake (Wular), largest lagoon (Chilika), longest lake (Vembanad), crater lake (Lonar), saline lake (Sambhar), and lake-state associations. Questions on Pangong Tso, Dal Lake, Loktak phumdis, and lake pollution are frequently asked across all exams.