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Osyotr River (Russian: Осётр) is a river in Tula and Moscow Oblasts in Russia, a right tributary of the Oka River. The length of the river is 228 km. The area of its basin is 3,480 km². The Osyotr freezes up in November and stays icebound until the first half of April. The town of Zaraysk is located on the Osyotr River.
- This article includes content derived from the Great Soviet Encyclopedia, 1969–1978, which is partially in the public domain.
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