https://en.wikipedia.org/wiki/Slavonia
WebSlavonia (/ s l ə ˈ v oʊ n i ə /; Croatian: Slavonija) is, with Dalmatia, Croatia proper, and Istria, one of the four historical regions of Croatia.. Slavonia is located in the Pannonian Basin, largely bordered by the Danube, Drava, and Sava rivers. In the west, the region consists of the Sava and Drava valleys and the mountains surrounding the Požega …