Ostyor

River in Russia, Belarus

The Ostyor, or Ascior is a river in Pochinkovsky, Roslavlsky, and Shumyachsky Districts of Smolensk Oblast in Russia and in Klimavichy and Krychaw Districts of Mogilev Region of Belarus. It is a left tributary of the Sozh. The Ostyor is 274 kilometres (170 mi) long, and has a 3,490 square kilometres (1,350 sq mi) basin. The town of Roslavl is located on the left bank of the Ostyor. The lower course of the Ostyor marks the state border between Russia and Belarus.

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