The Osyotr () is a river in Tula and Moscow Oblasts in Russia, a right tributary of the Oka.Осётр, Great Soviet Encyclopedia The length of the river is . The area of its basin is .«Река ОСЕТР», Russian State Water Registry 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.
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