On the south western side lies Uttari Chamrao Glacier, Dakshini Chamrao Glacier, Balbala Glacier, Khagyan Glacier and Paschimi Kamet glacier all these glaciers drain their water in the Saraswati River which then joins Alaknanda River at Keshav Prayag near Mana village one of the main tributaries of river Ganga. River Alaknanda merges with river Bhagirathi the other main tributaries of river Ganga at Dev Prayag and called Ganga there after.