In the Vukovar-Srijem County, between the Sava and the Danube, and in the area of ​​the Bosut River and its tributaries Spačva, Brežnica and Lubanj and the Studva River, the largest forest complex of common oak (Quercus robur L.) in Croatia has long been known as Spačva. It covers an area of ​​about 40,000 ha, and covers an area of ​​Syrmia in Vojvodina, thus having a total area of ​​51,592.92 ha. The Spačva forest is the largest complete common oak forest in Croatia.

The former Spačva forests were of the rainforest type, inaccessible, unarranged, they were real wilderness. In them, the main types of trees were common oak, lowland elm and field ash, which were 150, 200 and even 400 years old. The famous E. Lanier, a professor of forestry, once said: “If you want to taste real cognac, go to the French province of Cognac, and if you want to see real common oak, go to Slavonia.”