Gornje Podunavlje, Special Nature Reserve along Danube River in Vojvodina, Serbia

Gornje Podunavlje is a special nature reserve on the left bank of the Danube in Vojvodina, Serbia, covering 19,648 hectares. It comprises two large marshes, Monoštorski Rit and Apatinski Rit, along with floodplain forests of willow, poplar, ash and oak, wet meadows, oxbow lakes and 66 kilometers of the Danube's course from the Hungarian border to Bogojevo.

Protection of this area began in 1955 when it covered just 10 square kilometers as a small reserve. In 2001 it was upgraded to Special Nature Reserve status, which marked a major expansion of its protected boundaries.

The reserve's name means "Upper Danube Valley", and its marshes carry names from nearby settlements: Monoštorski Rit after Monoštor, Apatinski Rit after Apatin. The Serbian Wikipedia article lists the reserve's units as Monoštorski rit, Apatinski rit and the areas of Štrbac, Kozara and Karapandža. The reserve lies on the left bank of the Danube, from the Hungarian border to Bogojevo, and is part of the five-country Mura-Drava-Danube biosphere reserve.

The reserve stretches 64 km along the Danube's left bank, from the Hungarian border to Bogojevo, with two main marsh units: Monoštorski Rit and Apatinski Rit. The Štrbac, Kozara and Karapandža areas are also included. Parts of the reserve lie in the Croatia–Serbia border dispute, so check access conditions before visiting riverside zones.

This reserve forms part of a cross-border conservation network with Hungary and Croatia and holds one-third of all plant species found in Serbia. This concentration of plant diversity makes it one of the most important natural areas in the Balkans for species protection.