Ghaghara, also called Karnali ( Karṇālī [kʌrˈnɑːliː]; Hindi: घाघरा Ghāghrā [ˈɡʱɑːɡrɑː]) is a perennial trans-boundary river originating on the Tibetan Plateau near Lake Mansarovar. It cuts through the Himalayas in Nepal and joins the Sharda River at Brahmaghat in India. Together they form the Ghaghra 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 Doriganj 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.