Selemdzha River (Russian: Селемджа) is a river in the Amur Oblast in Russia. It is the biggest tributary of the Zeya River. The length of the river is 647 km. The area of its basin 68,600 km². Its main tributaries are the Ulma and Nora. The Selemdzha River freezes up in early November and stays under the ice until early May.
