Mount Bona (Castle Hill) – butte, belongs to Kremenets Mountains. Adjoins to central part of Kremenets from east, and rises above it as volcanic cone about 100 meters high. Absolute highness is 397 meters above sea level. The mount is surrounded by deep ravines from three sides, and only from east is connected to plateau by narrow strip of watershed. Is famous for castle ruins on it. There are only ruins that left from the castle, but its location in very picturesque places, makes the unforgettable abidance on the mountain.