Bamchu Glacier on the eastern side joins Milam Glacier from there emerges Goriganga River that later joins the Kali River at Jauljibi. Uttari Nanda Devi Glacier on the western side joins Uttari Rishi Glacier and drains into Rish Ganga. Rishi Ganga met with Dhauliganga River near Rini. Later Dhauli ganga met with Alaknanda at Vishnuprayag. Alaknanda River is one of the main tributaries of river Ganga that later joins Bhagirathi River the other main tributaries of river Ganga at Devprayag and became Ganga there after.