BharatNotes Lakes are a high-frequency UPSC mapping topic — tested on superlatives (largest, longest, highest), formation type (tectonic, oxbow, lagoon, glacial), and the river/ecosystem each is linked to. The largest natural freshwater lake in India is Wular Lake (Jammu & Kashmir, tectonic origin, fed by the Jhelum). The largest inland saltwater lake is Sambhar (Rajasthan), while the largest brackish-water lagoon is Chilika (Odisha). The longest lake is Vembanad (Kerala, ~96.5 km). The highest lake is Cholamu / Tso Lhamo (North Sikkim, ~5,330 m, source of the Teesta). Many lakes overlap with the Ramsar Wetlands list, which UPSC pairs together.
Don't confuse: "Largest freshwater lake" (Wular, natural) vs "largest lake/lagoon overall" (Chilika, brackish lagoon) vs "largest inland salt lake" (Sambhar). UPSC sets traps on exactly this distinction.
Superlative Lakes (Most Frequently Tested)
| Superlative | Lake | State | Key Fact |
|---|---|---|---|
| Largest natural freshwater lake | Wular Lake | Jammu & Kashmir | Tectonic origin; fed by Jhelum; seasonal area ~30–189 sq km; Ramsar site |
| Largest inland saltwater (salt) lake | Sambhar Lake | Rajasthan | India's largest inland salt lake; major common-salt production; Ramsar; flamingo congregation |
| Largest brackish-water lagoon (largest lagoon) | Chilika Lake | Odisha | Largest coastal lagoon in India; Irrawaddy dolphins; largest wintering ground for migratory waterfowl on the subcontinent |
| Longest lake | Vembanad Lake | Kerala | ~96.5 km long; Kerala backwaters; Kuttanad below-sea-level farming; Ramsar |
| Highest lake (altitude) | Cholamu / Tso Lhamo | Sikkim | ~5,330 m; among the world's highest lakes; source of the Teesta River |
| Largest freshwater lake in NE India | Loktak Lake | Manipur | Famous for phumdis (floating biomass); Keibul Lamjao — the only floating national park in the world |
| Largest (shallow) freshwater lake in South India | Kolleru Lake | Andhra Pradesh | Between the Krishna and Godavari deltas; Ramsar; Grey Pelican, Painted Stork |
Lake Types by Formation (UPSC Conceptual Angle)
| Type | How it forms | Indian examples |
|---|---|---|
| Tectonic | Crustal faulting / down-warping creates a basin | Wular (J&K) |
| Glacial (tarn / moraine-dammed) | Glacier-scoured hollows or moraine dams | Many Himalayan high-altitude lakes (Pangong, Tso Moriri, Gurudongmar, Cholamu) |
| Lagoon (coastal) | A sandbar/spit cuts off a part of the sea | Chilika (Odisha), Pulicat (TN/AP), Vembanad & Ashtamudi (Kerala) |
| Oxbow | A river meander is cut off, leaving a crescent lake | Common in the Ganga and Brahmaputra floodplains (e.g. Kanwar/Kabartal, Bihar) |
| Salt (playa / endorheic) | Inland basin with no outlet; evaporation concentrates salt | Sambhar, Didwana (Rajasthan) |
| Volcanic (crater) | Water fills a volcanic crater | Lonar Lake (Maharashtra) — meteorite-impact crater in basalt; Ramsar |
| Artificial (reservoir) | Man-made by damming a river | Govind Ballabh Pant Sagar (Rihand), Gobind Sagar (Bhakra), Dhebar/Jaisamand |
Exam tip: Lonar Lake is technically a meteorite-impact crater lake (in Deccan basalt), not a volcanic crater — a classic UPSC distinction. It became a Ramsar site in 2020.
State-wise Notable Lakes
| State / UT | Lakes | Notes |
|---|---|---|
| Jammu & Kashmir / Ladakh | Wular, Dal, Manasbal, Pangong Tso, Tso Moriri | Wular largest freshwater; Pangong Tso is a high-altitude endorheic lake on the India–China LAC |
| Rajasthan | Sambhar, Pushkar, Didwana, Pichola, Fateh Sagar, Jaisamand | Sambhar largest inland salt lake; Jaisamand is a large artificial lake |
| Odisha | Chilika | Largest coastal lagoon in India |
| Kerala | Vembanad, Ashtamudi, Sasthamcotta | Vembanad longest; Sasthamcotta is the largest freshwater lake in Kerala |
| Andhra Pradesh / Telangana | Kolleru, Pulicat (shared with TN), Hussain Sagar | Pulicat is the 2nd largest brackish lagoon in India |
| Manipur | Loktak | Phumdis; Keibul Lamjao floating national park |
| Tamil Nadu | Pulicat, Kaliveli, Ooty | Pulicat shared with AP |
| Sikkim | Cholamu (Tso Lhamo), Gurudongmar | Among the highest lakes in India |
| Maharashtra | Lonar, Powai | Lonar — meteorite-impact crater lake |
| Himachal Pradesh | Renuka, Chandratal, Suraj Tal, Gobind Sagar | Renuka is HP's largest natural lake; Gobind Sagar is a Bhakra reservoir |
Quick UPSC Pointers
- Wular = largest freshwater (natural); Chilika = largest lagoon; Sambhar = largest inland salt lake; Vembanad = longest; Cholamu/Tso Lhamo = highest.
- Loktak (Manipur) → phumdis + Keibul Lamjao (only floating national park).
- Lonar (Maharashtra) → meteorite-impact crater lake in basalt (Ramsar, 2020).
- Pangong Tso → high-altitude brackish endorheic lake on the India–China LAC.
- Kuttanad (around Vembanad) → below-sea-level farming; a GIAHS site.
- Many of these are also Ramsar sites — cross-reference the Ramsar Wetlands and National Parks mapping pages.
Primary sources: Wikipedia (Wular Lake, Sambhar Salt Lake, Vembanad, Loktak Lake, Kolleru Lake, Tso Lhamo Lake); Drishti IAS / Insights on India lake briefs; Andhra Pradesh Forest Department (Kolleru). All superlatives cross-checked against 2+ sources (as of June 2026).
