The
Manas River (Pron: ˈmʌnəs; in Bhutan
Drangme Chhu; in China
Niamjang) is a transboundary river in the
Himalayan foothills between southern
Bhutan and
India. It is named after
Manasa, the serpent god in
Hindu mythology. It is the largest river system of Bhutan, among its four major river systems; the other three are Amo Chu or
Torsa, Wong Chu or
Raidak, Mo Chu or
Sankosh. It is met by three other major streams before it again debouches into India in western
Assam. The total length of the river is , flows through Bhutan for and then through Assam for before it joins the mighty
Brahmaputra River at
Jogighopa. Another major tributary of the Manas, the Aie river joins it in Assam at Bangpari.