The Kalaus (Russian: Калаус) is a north-flowing river on the Black Sea-Caspian Steppe of southern Russia, in Stavropol Krai. It is 436 kilometres (271 mi) long, and has a drainage basin of 9,700 square kilometres (3,700 sq mi). It is a tributary of the Manych. Formerly, when it reached the Manych, part of its waters would flow east and part west. Today a low dam blocks flow into the east Manych.

• Article in the Great Soviet Encyclopedia