The river has its source in the confluence of two small rivers of the Kolyma Highlands at an elevation of and flows roughly westwards in its upper course. After a sharp bend it flows northwards along the eastern flank of the Omsukchan Range. North of Omsukchan town the intermontane basin where the river flows is up to wide and includes extensive wetland areas, as well as dense forests. Finally it joins the right bank of the Kolyma from its mouth.