Ostyor

The Ostyor (Russian: Остёр), or Ascior (Belarusian: Асцёр) 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. It is 274 kilometres (170 mi) long, and the area of its basin 3,490 square kilometres (1,350 sq mi). The town of Roslavl is located on the left bank of the Ostyor. The lower course of the Ostyor makes the state border between Russia and Belarus.

Ostyor

The Ostyor (Russian: Остёр), or Ascior (Belarusian: Асцёр) 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. It is 274 kilometres (170 mi) long, and the area of its basin 3,490 square kilometres (1,350 sq mi). The town of Roslavl is located on the left bank of the Ostyor. The lower course of the Ostyor makes the state border between Russia and Belarus.