Question: Are both rivers, Poschiavino and Ostyor River, located in the same country?
Sentence (from "Ostyor River"): 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.
Relevant evidence: Yes