Ramganga River is the most important factor for the maintenance of Jim Corbett Park. In fact without this river, there would be no Corbett Park established. This river is the tributary of Ganga and the largest of the precious few persistent sources of water in the Park. A rain-fed river originates near Gairsain in the Lower Himalayas. The course of the Ramganga River covers more than 100 km before entering Corbett near Marchula. Inside the Park it flows roughly 40 km till Kalagarh where it enters the plains. During this course through the Park it gathers its waters from the Palain, Sonanadi and Mandal rivers.

The region where river Ramganga flows is inhabited by key aquatic species like the endangered gharials, mahseer fish, mugger crocodiles, otters and turtles. Many species of birds, like kingfishers, terns, fish-eagles and storks depend on the Ramganga. During winter months the Ramganga reservoir attracts many migratory bird species, especially water birds from Europe and Central Asia.

For the survival of such a amazing range of floral and faunal species in Jim Jim Corbett National Park has been specially taken care of. The Ramganga river forms the most important hydrological resource, supplemented by many tributaries, among which most prominent are the Sonanadi, Mandal and Palain rivers.

The river Kosi runs very close to the Park and is also a significant water resource for nearby areas. Wildlife is heavily dependent on rivers, even more in the dry season, for they provide drinking waters and also form a great haven for several endangered aquatic species.

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