Šabac Fortress built
1471 CE.
Shown on the map at 44.764°, 19.703°.
Šabac fortress (Serbian: Шабачка тврђава, romanized: Šabačka tvrđava; Turkish: Böğürdelen Kalesi), is a fortress next to modern day Šabac, on the right riverbank of Sava.
Text from the Wikipedia article Šabac Fortress, licensed CC BY-SA 4.0.