Kostopil

thumb|St. Alexander Nevsky Church thumb|Catholic church thumb|Kostopil bus station thumb|Zamchysko River in Kostopil Kostopil ( ; ) is a small city on the river in Rivne Oblast, western Ukraine (historical Volhynia). It was the administrative center of the Kostopil Raion up to 2020, but is now within the Rivne Raion. Population: