Key facts

  • Banas is the longest river flowing entirely within Rajasthan, and Bisalpur Dam on Banas was constructed in 1999 at Deoli in Tonk.
  • Sambhar is Rajasthan's classic inland saline Ramsar lake; its Ramsar designation date is 23 March 1990 and its listed area is 24,000 ha.
  • Khichan, Menar and Siliserh entered the Rajasthan Ramsar current-affairs layer in 2025, while Keoladeo and Sambhar remain older fixed map pairs.

Key Points at a Glance

  1. 1

    The Aravalli range is Rajasthan's main drainage divide, separating Bay of Bengal, Arabian Sea and internal drainage systems.

  2. 2

    Chambal is the major Yamuna-system river of south-eastern Rajasthan and anchors the Gandhi Sagar-Rana Pratap Sagar-Jawahar Sagar-Kota Barrage sequence.

  3. 3

    Banas is the longest river flowing entirely within Rajasthan, and Bisalpur Dam on Banas was constructed in 1999 at Deoli in Tonk.

  4. 4

    Luni rises near the Ajmer Aravalli-Pushkar area, flows south-west through western districts and becomes saline in its lower course.

  5. 5

    Mahi and Sabarmati connect southern Rajasthan with Gujarat and the Arabian Sea side; Mahi Bajaj Sagar is linked with the Banswara belt.

  6. 6

    Ghaggar-Hakra is an ephemeral northern inland-drainage system of Hanumangarh, associated with the Nali name and the Kalibangan-Pilibanga tract.

  7. 7

    Sambhar is Rajasthan's classic inland saline Ramsar lake; its Ramsar designation date is 23 March 1990 and its listed area is 24,000 ha.

  8. 8

    Khichan, Menar and Siliserh entered the Rajasthan Ramsar current-affairs layer in 2025, while Keoladeo and Sambhar remain older fixed map pairs.

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Physiographic Frame and the Aravalli Divide

Rajasthan's drainage is best understood through relief before memorising individual river names. The Aravalli range runs broadly north-east to south-west and acts as the state's main water divide. East and south-east of the divide, rivers move towards the Chambal-Yamuna-Bay of Bengal system. South and south-west of the divide, Mahi, Sabarmati and Luni show the Arabian Sea orientation. In northern and western desert tracts, several streams end in inland basins, salt pans or sand-dune areas.

This divide also explains why the same state contains deep river valleys, multipurpose dams, saline lakes, dry beds and seasonal channels. Questions often test a chain: river origin, direction of flow, district or belt, final outfall, dam or lake association. Kota-Bundi-Baran-Jhalawar belongs to the Chambal-Hadoti clue; Banswara-Dungarpur belongs to the Mahi clue; Hanumangarh belongs to the Ghaggar-Hakra clue; and Udaipur-Rajsamand sits near several Aravalli-origin water bodies.

Remember the map first: Aravalli relief decides whether a fact belongs to east-flowing rivers, west-flowing rivers or internal drainage.

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