Key facts

  • The Aravalli range is Rajasthan's main drainage divide, separating Bay of Bengal, Arabian Sea and internal drainage systems.
  • Chambal is the major Yamuna-system river of Rajasthan and is linked with Gandhi Sagar, Rana Pratap Sagar, Jawahar Sagar and Kota Barrage.
  • Banas is the longest river flowing entirely within Rajasthan, and Bisalpur Dam on Banas is a key drinking-water fact for Jaipur and Ajmer.
  • Luni explains western Rajasthan's arid drainage: seasonal flow, increasing salinity, Barmer-Jalore course and movement towards the Rann of Kutch.
  • Mahi and Sabarmati connect southern Rajasthan with Gujarat and the Gulf of Khambhat, unlike the east-flowing Chambal-Banas system.

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 Rajasthan 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 Bisalpur Dam on Banas is a key drinking-water fact for Jaipur and Ajmer.

  4. 4

    Luni explains western Rajasthan's arid drainage: seasonal flow, increasing salinity, Barmer-Jalore course and movement towards the Rann of Kutch.

  5. 5

    Mahi and Sabarmati connect southern Rajasthan with Gujarat and the Gulf of Khambhat, unlike the east-flowing Chambal-Banas system.

  6. 6

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

  7. 7

    Sambhar is the key inland saline Ramsar lake of Rajasthan, while Khichan, Menar and Siliserh add the current wetland layer.

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Physiographic Divisions and the Aravalli Divide

Rajasthan's physical geography is easiest to revise through relief. The Aravalli range runs roughly north-east to south-west and works as the main watershed. East and south-east of the divide, rivers such as Chambal, Banas, Kali Sindh and Parbati move towards the Yamuna and the Bay of Bengal system. South and south-west of the divide, Mahi, Sabarmati and Luni show the Arabian Sea orientation. In the north and west, weak channels and closed basins create internal drainage.

For an objective paper, the main division is not a long description of landscapes but the map logic: Aravalli origins, Hadoti river valleys, southern Rajasthan's Gujarat-facing flow, western salt-bearing basins and northern dry channels. Udaipur and Rajsamand are useful origin belts, Kota-Bundi-Baran-Jhalawar mark the Chambal-Hadoti side, Banswara-Dungarpur marks the Mahi side, and Hanumangarh marks the Ghaggar-Hakra tract.

Exam takeaway: first place a river or lake on the correct side of the Aravalli divide, then attach its district and final drainage direction.

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