Ghaghara, also called Karnali (; "Ghāghrā" ; "Karṇālī" [kʌrˈnɑːliː; ; "Jiāgélāhé" [t͡ɕi̯ákɤ̌láxɤ̌]) is a perennial trans-boundary river originating on the Tibetan Plateau near Lake Manasarovar. It cuts through the Himalayas in Nepal and joins the Sharda River at Brahmaghat in India. Together they form the Ghaghara River, a major left bank tributary of the Ganges. With a length of it is the longest river in Nepal. The total length of Ghaghara River up to its confluence with the Ganges at Revelganj in Bihar is . It is the largest tributary of the Ganges by volume and the second longest tributary of the Ganges by length after Yamuna.