Nepal is known as the second richest country after Brazil for water resources potential. There are about 6000+ rivers in the country. Most of these rivers originate in the Mountain, Middle Hill (Mahabharat Lekh) and in the Churia Hill. The rivers originated from the mountains are the snow fed rivers. The flow of water in the river originating from the middle hill decreases during the winter. The rivers originating from the Churia are non-perennial. Most of these rivers dry up in winter season.

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 Koshi (the longest river in Nepal)

·         Seven tributaries of Koshi:  Arun, Sunkoshi, Tamakoshi, Dudhakoshi, Indrawati, Likhu and Tamor.

·         Sevgen tributaries of gandaki namely Kalli Gandaki, Budhi Gandaki, Marsyangdi, Trishuli, Seti, Madi and Daraudi.

·         Main tributaries of Karnali include Humla Karnali, Mugu Karnali, Bheri, Tila and seti.

·         Mechi

·         Mahakali

·         Bagmati

·         Kamala

·         Rapti

·         Tinau

·         Babai

·         Ratu

·         Lal Bakaiya