Biogeochemistry of major world rivers, Egon T. Degens, Stephan Kempe, International Council of Scientific Unions. Scientific Committee on Problems of the Environment, United Nations Environment Programme, Wiley, 1991, ISBN 978-0-471-92676-4, ... Based on water content, Ob is the third largest river of the Soviet Union. The river is formed by the confluence of mountain torrents Biya (outflowing from Teletskoye Lake) and Katun (taking its source from Belukha Mountain glaciers) ...
