Sremska Mitrovica is a city in Serbia. It is situated on the left bank of the Sava river. As of 2022, the city has a total population of 40,144 inhabitants, while its administrative area has a population of 72,580 inhabitants.

The Sava is a river in Central and Southeast Europe, a right-bank and the longest tributary of the Danube. It flows through Slovenia, Croatia and along its border with Bosnia and Herzegovina, and finally through Serbia, feeding into the Danube in its capital, Belgrade. The Sava forms the main northern limit of the Balkan Peninsula, and the southern edge of the Pannonian Plain.