The Orulgan Range is deeply cut by riverine intermontane basins with the Undyulyung, Begydzhan, Soboloh-Mayan, Menkere, Dzhapdzhan, Byosyuke and other right tributaries of the Lena River flowing westwards. To the east flow the Omoloy and its left tributaries, as well as the Bytantay, a left tributary of the Yana River.