EntityQ1421535· pop 23· linked from 10 articlesPraSign in to saveriver in Moscow and Ryazan Oblast, RussiaConnectionsRussiaCountryRussianEntityriverEntityCaspian SeaEntityVolgaEntitygeographic coordinate systemEntityMoscow OblastEntityRyazan OblastEntitydrainage basinEntitytributaryEntityOkaEntityriver mouthEntityGreat Soviet EncyclopediaEntityPra RiverEntityCategoriesRivers of Moscow OblastRivers of Ryazan OblastTributaries of the Oka