The Berezina or Byarezina 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. The width of the river is 15–20 m, the maximum is 60 m. The banks are low, steep in some areas, sandy, and the floodplain is swampy. The Berezina usually freezes over in the fir…The Berezina or Byarezina 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. The width of the river is 15–20 m, the maximum is 60 m. The banks are low, steep in some areas, sandy, and the floodplain is swampy. The Berezina usually freezes over in the first half of December.