Narayani the largest river of Nepal

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Chitwan District is located in the southwestern corner of the Central Development Region of Nepal, between latitudes 27°21' and 27°46' and longitudes 85°55' and 85°35'. It is a part of Nepalese midlands, a relatively flat area at an altitude of 244 m above mean sea level, with a sub-tropical climate. During heavy rains, a major portion of this area is flooded. The region is drained by the Narayani River catchment, and the river eventually discharges into the Ganga River in India.

The Narayani River is one of the largest rivers in Nepal. It is the final collector of seven extremely complex drainage systems of the Trans-Himalaya and consists of countless creeks, hill streams, rivers, forest lakes, wetlands, floodplains and oxbows. The Kaligandaki is the main feeder system of the Narayani. It originates on the Tibetan plateau and cuts through the Nepal Himalayas between Dhaulagiri and Annapurna, forming the world's deepest gorge. After joining the trisuli River in Deoghat it is called the Narayani, which runs for approximately 332 km through Nepal before it spills onto the Gangetic plains of India. The Kaligandaki/Narayani system cuts through all of Nepal's varied zones and thus presents an excellent opportunity to examine the fish distribution along an impressive altitudinal gradient.