Zdolbuniv is a city in the Rivne Raion of Rivne Oblast, in the historical region of Volhynia, western Ukraine. It has an important railway station and a cement plant. Population: 25,040.

Ostroh is a city in Rivne Oblast, western Ukraine. It is situated on the Horyn River. Ostroh was the administrative center of Ostroh Raion until 2020, but as a city of oblast significance did not belo