Tangon River also known as the Tongon River. The river was named after the name of Zamindar Tankonath of ranisankail upazila in thakurgaon district. It enters Bangladesh from the Indian state of West Bengal through the western border of panchagarh district (which lies in the northwestern corner of the country). It passes through Ruhia, pirganj and bochaganj. It again enters West Bengal through biral upazila of Dinajpur. It returns to Bangladesh when it meets with the punarbhaba near Rohanpur of naogaon district. It becomes dry during winter and navigable in the rainy season. In 1989, a five-vent barrage was built over this river 10 km west of boda. About 5,000 ha of land including 1,000 to 1,500 ha of wheat fields get gravity irrigation in the dry season. [Mesbah-us-Saleheen]
See map in brahmaputra-jamuna river system.