Sambhar Lake

Geography glossary

Topic: Drainage System of India: Rivers, Basins and Patterns · NCERT: Beyond NCERT

Meaning

Sambhar Lake is India's largest inland saline lake (a salt-water lake far from the sea). It lies about 80 km west of Jaipur, on the edge of the Thar desert in Rajasthan, and is a major source of common salt.

It shows clearly how inland drainage works in a dry region: streams flow into a closed hollow, the water evaporates, and salt is left behind. It is also a Ramsar site, and it made the news in 2019 when thousands of migratory birds died there from avian botulism.

Explanation

How Sambhar gets its water: centripetal and inland drainage

  • Four main seasonal streams feed the lake from a catchment (the land area that drains into it) of about 2,688 km² [2].
  • Centripetal drainage: streams flow inward from all sides towards one central low point, like spokes of a wheel meeting at the hub.
  • Inland drainage: the water never reaches the sea. It ends in a closed basin on land.
  • Sambhar is the end point of this kind of drainage. It has no outlet, so the only way water leaves is by evaporation.

Why the lake is salty: cause → process → result

  • Cause: salts come in with the rain water.
  • Monsoon streams pick up dissolved salts from the rocks and soil they flow over.

  • They carry these salts into a basin that has no outlet.

  • Process: the desert sun evaporates the water.

  • Sambhar sits on the edge of the Thar, so the sun is strong and the air is dry.

  • The water evaporates, but the salt cannot evaporate with it.

  • Result: salt is left behind.

  • The salt builds up year after year and forms a crust on the lake bed.

  • In the classification of lakes by origin, Sambhar is a wind-made / inland saline lake. It belongs to the same group as Didwana.

Size, depth and conditions

  • Very shallow: only 0.5–2.0 m deep [2].
  • Area: 24,000 ha [2].
  • Conditions it needs:
  • a dry climate, so that evaporation is high
  • a closed hollow with no outlet

  • seasonal streams that bring water and salts in the monsoon

  • The water is shallow and spread over a wide area, so it evaporates quickly. That is why the lake can produce salt on a large scale.

Uses, status and the 2019 bird deaths

  • Salt: it is a major source of common salt.
  • Birds: it is a winter home for flamingos and other migratory birds.
  • Ramsar site: designated on 23 March 1990 [1]. A Ramsar site is a wetland listed as a "Wetland of International Importance" under the Ramsar Convention on Wetlands (1971, Ramsar, Iran).
  • 2019 bird deaths:
  • Thousands of migratory birds died at Sambhar in 2019 from avian botulism.
  • Avian botulism is a disease in birds that paralyses them. It is caused by a toxin (poison) made by the bacterium Clostridium botulinum.
  • The bacterium grows in warm, stagnant water (water that does not flow). A shallow lake in a hot region can provide these conditions.

Where it occurs

  • Sambhar Lake: Rajasthan, about 80 km west of Jaipur, on the edge of the Thar. It is India's largest inland saline lake.
  • Didwana: a smaller saline lake of the same type in Nagaur district, Rajasthan.
  • Same drainage pattern elsewhere: Pangong Tso in eastern Ladakh is also endorheic (it has no outlet to the sea). It is brackish because dissolved minerals build up in it. However, it formed in a different way (tectonic) and lies at a high altitude.
  • Ramsar listing in Rajasthan: Sambhar (1990) [1]. Keoladeo Ghana National Park was one of India's first two Ramsar sites (1981), along with Chilika [1].

Don't confuse with

  • Chilika Lake (Odisha): a coastal lagoon with brackish water (partly salty). It stays linked to the Bay of Bengal through its mouths. Sambhar is inland and has no link to the sea. Its salt comes from evaporation in a closed basin.
  • Pangong Tso (Ladakh): also endorheic and salty. But it is tectonic: it lies in a trough between mountain ranges at about 4,350 m. Sambhar is a wind-made / inland saline lake in the low, hot Thar margin.
  • Lonar Lake (Maharashtra): also saline, but it is a crater lake made by a meteorite impact in basalt [3]. Sambhar was not made by an impact. It is a shallow hollow where salt collects.
  • Keoladeo Ghana NP (Rajasthan): Rajasthan's first Ramsar site (1981) [1]. Sambhar came later, in 1990 [1]. Do not call Sambhar one of India's first Ramsar sites.

Prelims Hooks

  • Sambhar = India's largest inland saline lake, about 80 km west of Jaipur, Rajasthan.
  • Ramsar trap: Sambhar, Wular and Loktak were all designated on the same day, 23 March 1990 [1].
  • Drainage pattern: Sambhar is fed by four seasonal streams from a catchment of about 2,688 km² [2]. This makes it an example of centripetal / inland drainage.
  • Depth and area: 0.5–2.0 m deep and 24,000 ha [2]. It is very shallow, which is why evaporation and salt-making are so effective.
  • Lake–type pair: Sambhar and Didwana (Nagaur) = inland saline lakes. Lonar = crater; Chilika = lagoon; Kanwar Tal = oxbow.
  • 2019 event: mass bird deaths from avian botulism, caused by a toxin of Clostridium botulinum in warm, stagnant water.

Mains Points

  • Sambhar shows how inland drainage works in dry lands (GS-I).
  • Seasonal streams flow inward to a closed low point and never reach the sea [2].
  • High evaporation leaves salt behind, so the lake becomes a natural salt pan.

  • So the same drainage process creates both a salt resource and a wetland habitat.

  • Using the resource vs keeping the wetland healthy (GS-III).

  • Sambhar is a major source of common salt, and it is also a Ramsar wetland for flamingos and other migratory birds [1].
  • The 2019 avian botulism deaths showed that a shallow lake with warm, stagnant water is fragile.

  • Common threats to Indian lakes also apply here: encroachment on the lake bed, pollution, and changes to how water flows in.

  • Policy response: Ramsar listing, plus a lake-level management body (like the Chilika Development Authority) that protects inflows and monitors water quality, can help stressed inland lakes like Sambhar. Chilika shows the model: restoring natural water flow helped it recover and leave the Montreux Record (a Ramsar list of wetlands whose ecological character is changing because of human interference) in 2002.

Related concepts

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Sources

  1. 1Ramsar Sites of India (as on 21.04.2026), MoEFCCmoef.gov.in · tier 1
  2. 2Sambhar Lake (Rajasthan), Ramsar Information Sheetrsis.ramsar.org · tier 2
  3. 3Lonar Crater, India, NASA Earth Observatoryscience.nasa.gov · tier 2