Burhi Gandak River is a tributary of the Ganges. The Burhi (“Old”) Gandak flows parallel to and east of the Gandak River in an old channel.[1][2]
The Budhi Gandak originates (starts) from Chautarwa Chaur near Bisambharpur in the district of West Champaran in Bihar.[3] It at first flows through the East Champaran district. After flowing for a distance of about 56 kilometres (35 mi), the river takes a south-turn where two rivers - the Dubhara and the Tour join it. The total length of the river is 320 kilometres (200 mi). The drainage area of the river is 10,150 square kilometres (3,920 sq mi).[1]