Wikipedia
Osława
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Osława River
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The Osława (Czech: Oslava, , Ukrainian: Ослава) is a river in South-Eastern Poland. Its name comes from the ancient west Slavic dialect word osła, meaning "stone". It begins in the Bieszczady mountains and flows through western Sanok Land. The river ultimately flows into the San River at Zasław, north of Zagórz.