Dakshini Rishi Glacier on the eastern side and Trisul Glacier on the western side. both these glacier drains into Rish Ganga. Rishi Ganga met with Dhauli ganga near Rini. Later Dhauli ganga met with Alaknanda at Vishnu Pryag. Alaknanda River is one of the main tributaries of river Ganga that later joins Bhagirathi River the other main tributaries of river Ganga at Dev Pryag and became Ganga there after.