Key facts

  • The Aravalli range is Rajasthan's main drainage divide, separating Bay of Bengal, Arabian Sea and internal drainage systems.
  • Chambal is Rajasthan's major Yamuna-system river and is linked with Gandhi Sagar, Rana Pratap Sagar, Jawahar Sagar and Kota Barrage.
  • Banas is the longest river flowing entirely within Rajasthan and is linked with Bisalpur Dam on the Banas in Tonk.
  • Luni rises near the Ajmer-Pushkar Aravalli area, flows south-west through western Rajasthan and loses identity towards the Rann of Kutch.
  • Mahi and Sabarmati show Rajasthan's west-flowing Arabian Sea connection through southern Rajasthan and Gujarat.

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 Rajasthan's major Yamuna-system river and is linked with Gandhi Sagar, Rana Pratap Sagar, Jawahar Sagar and Kota Barrage.

  3. 3

    Banas is the longest river flowing entirely within Rajasthan and is linked with Bisalpur Dam on the Banas in Tonk.

  4. 4

    Luni rises near the Ajmer-Pushkar Aravalli area, flows south-west through western Rajasthan and loses identity towards the Rann of Kutch.

  5. 5

    Mahi and Sabarmati show Rajasthan's west-flowing Arabian Sea connection through southern Rajasthan and Gujarat.

  6. 6

    Ghaggar-Hakra is an ephemeral northern inland-drainage system linked with Hanumangarh, Nali, Kalibangan and the Saraswati tradition.

  7. 7

    Sambhar is Rajasthan's classic inland saline Ramsar wetland, designated on 23 March 1990 as Ramsar site 464.

  8. 8

    Keoladeo, Sambhar, Menar, Khichan and Siliserh are Rajasthan's Ramsar-current-affairs names, with Menar, Khichan and Siliserh added in 2025.

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Aravalli Divide and Drainage Pattern

Rajasthan's physiography is best understood through the Aravalli range. The range runs roughly north-east to south-west and works as the state's main watershed. East of the divide, rivers move towards the Yamuna and the Bay of Bengal system. South and south-west of the divide, rivers move towards Gujarat and the Arabian Sea. West and north of the divide, weak drainage often ends inside inland basins instead of reaching the sea.

This gives Rajasthan three broad drainage systems: Bay-of-Bengal drainage, Arabian-Sea drainage and internal drainage. Chambal, Banas, Kali Sindh, Parbati, Banganga, Gambhiri and Mej belong to the east-flowing side. Mahi, Sabarmati and Luni represent the Arabian-Sea orientation. Ghaggar-Hakra, Kantli, Sabi, Sota-Ruparel and desert basins belong to internal drainage. District clues matter: Kota, Bundi, Baran and Jhalawar fit the Chambal-Hadoti belt; Banswara and Dungarpur fit the Mahi belt; Hanumangarh fits the Ghaggar-Hakra belt.

Exam takeaway: first place the river on the correct side of the Aravalli divide, then attach its district, dam or lake clue.

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