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Key Facts about Sankosh River

Oct. 30, 2026

More than 10,000 people have been recently moved to shelters in West Bengal’s Alipurduar district following a glacial lake outburst in neighbouring Bhutan, as authorities placed the Sankosh river system on red alert over fears of a sudden flood surge.

About Sankosh River:

  • It is a major transboundary river flowing through Bhutan and India.
  • It is one of the major north bank tributaries of the Brahmaputra
  • In Bhutan, the river is called “Puna Tsang Chu.”
  • Course:
    • It originates in northern Bhutan, where it is fed by glacial melt and snow from the Himalayas.
    • It is formed by the confluence of the Phochu and Mochu rivers.
    • It flows southward through Bhutan before crossing into India, where it flows through the Dhubri district of Assam and empties into the Brahmaputra River at Gauripur.
    • In its lower course it forms part of the boundary between the states of Assam and West Bengal.

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