The Mahananda River is a river the originates in the district of Darjeeling in West Bengal in the Himalayas. It flows through northern part of West Bengal, Bihar in India and Bangladesh. It again enters India in the Malda district of West Bengal before entering into Bangladesh to join the Ganges near the town of Chapai Nawabganj. This river is mainly fed by rainwater. During summer or winter it has very low water level and during monsoon it carries large amount of rainwater often causing floods. Some major places by the side of the river are Siliguri and Malda both in West Bengal, India.
In Bangladesh this rivers total length is 36 km.