The Selemdzha has its source where three mountain ranges meet the
Bureya Range, the
Dusse-Alin from the south, the
Ezop Range from the west and the
Yam-Alin from the north, and flows first northwest with the
Selemdzha Range to the north, and then westwards across the
Zeya-Bureya Plain. The
Baikal–Amur Mainline crosses the river just west of
Fevralsk and reaches the Zeya north of the
Trans-Siberian Railway and
Blagoveshchensk. Its main tributaries are the
Ulma and
Byssa on the left, as well as the
Nora and
Orlovka (Mamyn) on the right. The Selemdzha freezes up in early November and stays under the ice until early May. ==See also==