Rivers with their sources in the more massive Orulgan rising to the east cut across the Dzhardzhan Range through steep gorges and ravines. They are right tributaries of the Lena River flowing westwards, such as the Natara, Uel-Siktyakh and Kuranakh-Siktyakh. The Byosyuke flows in its northern limit while the valleys of the Syncha and Nelon, the two rivers which form the Menkere, are at its southern end.