GANDAK (gun-dak') (the Great Gandak; the Little Gandak being an unimportant tributary of the Gogra) a river of India, rising in the Nepal Himalayas, in lat. 30° 56' N. and lon. 79° 7' E., flowing S. W. to British territory, and then S. E., forming for some distance the boundary between the Northwest provinces and Bengal, and entering the Ganges opposite Patna.