Previous Year Question
Sankosh river forms boundary between:
Bihar and West Bengal
Assam and Arunachal Pradesh
Assam and West Bengal
Bihar and Jharkhand
Correct Answer: C
Detailed Solution
The Sankosh River originates in Bhutan and, after entering India, serves as a natural boundary between Assam and West Bengal.
The river forms part of the Brahmaputra river system. According to the Government of West Bengal's water resources description, Sankosh is one of the important eastern rivers of the Brahmaputra system in the state.
The Sankosh later joins Raidak-II and, after entering Bangladesh, ultimately meets the Brahmaputra under the name Gangadhar. Its total catchment area is reported to be about 10,146 sq km, with the largest share lying in Bhutan.
For examination purposes, three linked facts can be remembered—origin: Bhutan, boundary: Assam–West Bengal, and river system: Brahmaputra. These facts help solve most location-based questions related to the Sankosh.