Panior River originates from a high mountain named Khoren Putu, which is located to the north-west of Sagalee, the sub-divisional headquarter of
Papum Pare District,
Arunachal Pradesh. The Pareing is its main tributary, that is formed by the Nirpung and Nirke streams.
The Panior is known as Ranga-Nadi in Assam and finally it falls into the Brahmaputra. Ranga-Nadi Hydro Electric project is on this river.
