- The settlement of Justiniana Prima was built on a raised and elongated plateau between two rivers, the Svinjarica river in the West and the Justinian river in the East.
- The fortress was divided into three parts: the Acropolis, the Upper and Lower city. Each part was surrounded by ramparts with watchtowers.
- Two main roads cut through the whole complex: the Kardo which ran in a north–south direction and the Dekamanus which ran in the East-West direction.
- Around the fortress, there were significantly larger suburbs which were also protected by walls of stone and earth.
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