The Berezina or Byarezina (Belarusian: Бярэзіна, romanized: Biarezina, IPA: [bʲaˈrɛzʲinɐ]; Russian: Березина) is a river in Belarus and a right tributary of the Dnieper. The river starts in the Berezinsky Biosphere Reserve. The length of the Berezina is 613 kilometres (381 mi). The width of the river is 15–20 m, the maximum is 60 m. The banks are low (up to 0.5 m), steep in some areas (up to 1.5 m high), sandy, and the floodplain is swampy. The Berezina usually freezes over in the first half of December.
Its main tributaries are Bobr, Klyava, Ol'sa and Ala from the left and Hayna and Svislach from the right. The Berezinsky Biosphere Reserve by the river is on the UNESCO list of biosphere reserves. Peat bogs cover 430 km and thus occupy a large part of the reserve. These open peat zones have remained virtually untouched and are among Europe's largest bogs.
