Border Security Force (Water Wing) is one of the special units of Border Security Force of India.
It is responsible for patrolling riverine borders in North Bengal frontier, South Bengal frontier, Andaman Nicobar frontier, Tripura, Mizoram & Cachhar (TMC) Frontier, Jammu frontier, Punjab frontier and Gujarat frontier of the BSF. The Water Wing guards around 1399 km of riverine boundary of India.
References
Border Security Force (Water Wing) Wikipedia(Text) CC BY-SA