Most Recent Visit: July 2025 The Roman settlement of Sirmium was located on the left bank of the Savus (modern Sava) near its confluence with the Bacuntius (modern Bosut). Today, the modern city of Sremska Mitrovica, Serbia occupies the site of the ancient city. The region in which Sremska Mitrovica is located, Syrmia (Srem or…