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Most of the rivers originate in the Himalayas. These rivers added their tributaries during or after the Himalayan origin alongwith the developement of monsoon climate. After the formation of Mahabharat hills, the antecedent rivers changed their courses as Mahabharat stood as a barrier. As a result, most of the rivers changed their courses either to the east or west. Most of these rivers were responsible to deposit the sediments in the Churia basin. The major river systems namely the Koshi, the Karnali and the Gandaki belong to the antecedent group. Rivers originating from the Mahabharat range and cutting through Churia hills come under the second group, these include Kankai, Bagmati, Kamala etc. The third group of rivers originate from the southern face of the Churia hills.
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