Katun kəto͞on´ [key], river, c.415 mi (670 km) long, Altai Territory, S Siberian Russia. It rises in the Katun Alps and flows generally north to join the Biya, with which it forms the Ob River. The Katun is partly navigable.

The Columbia Electronic Encyclopedia, 6th ed. Copyright © 2012, Columbia University Press. All rights reserved.

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