The Bhāgīrathī is a turbulent Himalayan river in the state of Uttarakhand, India, that is the source stream of the Ganges—the major river of the Gangetic plain of Northern India and the holy river of Hinduism. The headwaters of the Bhagirathi are formed in the region of the Gangotri and Khatling glaciers in the Garhwal Himalaya. From its source, the river flows for about 700 km (435 mi) before meeting the Alaknanda river at an elevation of 475 m (1,558 ft) in the town of Devprayag. Downstream of this confluence, considered holy by Hindus, the river is known as the Ganga or Ganges. The controversial Tehri dam lies at the confluence of the Bhāgirathi and its tributary, the Bhilangna, near Tehri.