Syrmia (; ) is a fertile region of the Pannonian Plain in Europe, between the Danube and Sava rivers. It is divided between Serbia in the east and Croatia in the west. Most of Syrmia is located in the Srem and South Backa districts of Serbia's Autonomous Province of Vojvodina. A smaller part of the region around Novi Beograd, Zemun, and Surcin belongs to the City of Belgrade. The westernmost part is in eastern Croatia in Vukovar-Srijem.