The Mahananda is a trans-boundary river that flows through the Indian states of Bihar and West Bengal before crossing into Bangladesh. It is an important tributary of the Ganges. The Mahananda river system consists of two streams- one is locally known as Fulahar river and the other Mahananda. The Fulahar originates in the Himalayas in Nepal and tr…The Mahananda is a trans-boundary river that flows through the Indian states of Bihar and West Bengal before crossing into Bangladesh. It is an important tributary of the Ganges. The Mahananda river system consists of two streams- one is locally known as Fulahar river and the other Mahananda. The Fulahar originates in the Himalayas in Nepal and traverses through the Indian state of Bihar and merges with the Ganges in left opposite to Rajmahal. The Mahananda originates in the Himalayas: Paglajhora Falls on Mahaldiram Hill near Chimli, east of Kurseong in Darjeeling district at an elevation of 2,100 metres. It flows through Mahananda Wildlife Sanctuary and descends to the plains near Siliguri. It touches Jalpaiguri district.