The „Labudovo okno“ area is mostly located within the boundaries of the Special Nature Reserve "Deliblatska peščara" and consists of the 20-kilometer-long course of the Danube, from Ada Žilova near Dubovac to the mouth of the Nera River. It has become recognizable as one of the most important migratory stations and wintering grounds for waterfowl from Europe.
Marking the southern margin of the Pannonian Plain, "Labudovo okno" covers an area of 3,733 ha, the site encompasses an important stretch of the Danube and adjacent areas as well as the Nera River to the border with Romania.