Ramganga River is vital for Corbett in fact without it there would be no Corbett. It is the biggest of the valuable few lasting sources of water in the Park. A rainstorm encouraged stream starting close Gairsain in the Lower Himalayas, the Ramganga crosses more than 100 km before entering Corbett close Marchula. Inside the Park it flows around 40 km till Kalagarh where it enters the fields. Amid this gone through the Park it accumulates waters from the Palain, Mandal and Sonanadi rivers.
The Ramganga is occupied by key oceanic species like mahseer fish, the jeopardized gharials, mugger crocodiles, otters and turtles. Numerous types of winged creatures, in the same way as kingfishers, fish-birds, terns and storks rely on upon the Ramganga. Amid winters the Ramganga supply pulls in numerous transient feathered creature species, particularly water birds from Europe and Central Asia.