The Bhagirathi is a turbulent Himalayan river originating at Gaumukh from the Gangotri glacier at an elevation of 7,756 m (25,446 ft), in Uttarakhand. It flows for about 180 km before merging with the Alaknanda at an elevation of 465 m (1,526 ft) in the town of Devprayag. The river downstream from the holy confluence, Sangam, is known as the Ganges proper. Tehri dam lies at the confluence of the Bhagirathi and Bhilangana, near Tehri.