UPSC Prelims 2026·GS1·geography·indian river systems

Identify the river of the Indian sub-continent on the basis of the following information : 1. It has an antecedent drainage system. 2. It flows through three countries. 3. It originates in the Tibetan Plateau and is an important river for irrigation. 4. It does not form distributaries. Select the answer from the following :

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Last updated 25 May 2026, 8:23 pm IST
  1. ABrahmaputra
  2. BIndus
  3. CSutlejCorrect
  4. DTeesta

Explanation

The correct answer is (C) Sutlej.

The Sutlej River perfectly satisfies all four characteristics provided in the question:

  1. Antecedent Drainage: The Sutlej is an antecedent river, meaning its course was established before the tectonic uplift of the Himalayas. As the mountains rose, it maintained its path by carving deep gorges, such as the one at Shipki La.
  2. Three Countries: It is a transboundary river flowing through China (Tibet), India, and Pakistan.
  3. Origin and Irrigation: It originates from Lake Rakshastal near Mount Kailash in the Tibetan Plateau. It is highly critical for agricultural irrigation, feeding major infrastructure like the Bhakra-Nangal Dam and the Indira Gandhi Canal, which sustain farming in Punjab, Haryana, and Rajasthan.
  4. No Distributaries: A distributary is a stream that branches off and flows away from a main river channel, typically in a delta. Because the Sutlej acts solely as a tributary—merging with the Chenab River in Pakistan to form the Panjnad before joining the Indus—it never reaches the sea independently and forms no distributaries.

Why the other options are incorrect:

  • (A) Brahmaputra: While antecedent and flowing through three countries (China, India, Bangladesh), it splits into massive distributaries (like the Jamuna) to form the Ganges-Brahmaputra Delta.
  • (B) Indus: It flows through three countries and is antecedent, but it forms an extensive delta in Pakistan's Sindh province, branching into multiple distributaries before draining into the Arabian Sea.
  • (D) Teesta: The Teesta originates in Sikkim, India (not the Tibetan Plateau) and flows through only two countries (India and Bangladesh).

Takeaway: Remember that a river terminating by joining another river (as a tributary) generally lacks the capacity to form distributary networks, a geomorphological feature usually reserved for rivers creating deltas at a sea or ocean.

geography: Identify the river of the Indian sub-continent on the basis of the following information : 1. It has an antecedent drain

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