in Uttarakhand . The headwaters of the Bhagirathi are formed at Gaumukh , at the foot of the Gangotri glacier and Khatling glaciers in the Garhwal Himalaya. These two sacred rivers join to form the Ganges (Ganga) in Devprayag. Devprayag is 70 km from Rishikesh . Devprayag has an average elevation of