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Srem in Serbian or Srijem in Croatian (from Latin: Sirmium) is a fertile region of the Pannonian plain in Europe, between the Danube and Sava rivers. It is divided between Serbia and Montenegro and Croatia.
Most of Srem is located in Serbia's northern province of Vojvodina, in the Srem District. A small part of the region around Belgrade and Zemun is a part of Serbia proper. The westernmost part lies in eastern Croatia, in the Vukovar-Srijem county.
The region was historically a whole, notably under the Kingdom of Hungary in the Szerém county.
The regions principal hill is Fru?ka Gora.