Dobor Fortress
Usora Municipality, Bosnia and Herzegovina
Dobor was a medieval town of the Usora Zemlja, in present-day Bosnia and Herzegovina, located some 4 km northwest of Modriča, on the left side of the Bosna River, on the Vučjak hill with an average height of 39 meters.
Fort data from Wikidata (CC0). Summary from Wikipedia (CC BY-SA).