GANDAK, a river of northern India. It rises in the Nepal Himalayas, flows south-west until it reaches British territory, where it forms the boundary between the United Provinces and Bengal for a considerable distance and falls into the Ganges op posite Patna. A snow-fed stream, its floods endanger the sur rounding plains, lying at a lower level than its banks ; it is ac cordingly embanked.
The LITTLE GANDAK rises in the Nepal hills, enters Gorakhpur district about 8 m. west of the Gandak, and joins the Gogra just within the Saran district of Bengal.
The BURHI (or old) GANDAK also rises in the Nepal hills, and runs roughly parallel to and east of the Gandak, of which it represents an old channel, passing Muzaffarpur, and joining the Ganges nearly opposite to Moughjr. Its principal tributary is the Baghmati, which rises in the hills north of Kathmandu, flows southward through Tirhut, and joins the Burhi Gandak close to Rusera.