BEREZINA, a river in the White Russian S.S.R., a tributary of the Dnieper. It rises in the marshes of Borizov and flows south for 3 5om. (2 5om. navigable) , for the most part through low-lying but well-wooded country. It is linked with the Black sea and the Baltic, and is important for commerce, but is subject to severe floods. It was just above Borizov that Napoleon's army forced the passage of the Berezina, with enormous losses, on Nov. 26-28, 1812, during the retreat from Moscow.