Ramganga River is one of the perennial rivers flowing in the Corbett National Park. It is a rain fed river and covers a distance of 100 km before entering the national park. After entering the park, this river flows 40 km up to Kalagarh. The river is fed by tributaries, named the Palain, Mandal and Sonanadi. Mahseer fish, gharials, mugger crocodiles, otters, and turtles are found in the river. Besides, it attracts many migratory water birds from Central Asia and Europe during the winter season. Birds like fish-eagles, terns, storks, and kingfisher can also be seen here.