Originating in the foot hills of Nepal, the Rapti flows to the north of Behraich District
. After traversing about 130 km, it enters to the northern portion of the Gonda
before entering the Sant Kabir Nagar District
in the north-west. The Rapti then meets the Ghaghra River
The river has numerous tributaries, especially in the west bank. The River Ami is the main tributary.