1. Koshi River : This is biggest river of Nepal. Sunkoshi, Dudhkoshi, Tamakoshi, Arun, Tamor, Likhu are the main supporter river of Koshi river. This river called in India Damodar river. In India for this river also says Bihar’s sad because this river destroys many sources always in year.
2. Gandaki River : It is the deepest river of Nepal and Kali Gandaki, Budhi Gandaki, Seti Gandaki, Madi, Daraudi, Marshyandi & Trisuli are main supporter of its. In Terai Region of Nepal it’s called Narayani river.
3. Karnali River : It is the largest river of Nepal. Main supporter river of its are Humla Karnali, Mugu Karnali, Dhuli Bheri, Sani Bheri, Seti, Tila & Budhi Ganga. Its called as Ghagara river in India.