Lowland riparian forests can be found in the flood area of all major rivers of Slovenia, but are generally more widespread in the east. They are periodically flooded by nearby rivers (for example Sava, Krka, Mura, Drava) and support an interesting animal and plant community. The predominant tree species in these forests are Pedunculate Oak Quercus robur, Common Hornbeam Carpinus betulus, Common Alder Alnus glutinosa, European Ash Fraxinus excelsior and Narrow-leaved Ash Fraxinus angustifolia.

Some of the most notable examples of riparian forest in Slovenia include Krakovski gozd, Dobrava and the forests along the river Mura.

The two most characteristic birds in these ecosystems are Middle Spotted Woodpecker Dendrocopos medius and Collared Flycatcher Ficedula albicollis. Both species have high population densities in eastern Slovenia where lowland forests are still well-preserved. Rarer inhabitants include the Black Stork Ciconia nigra and White-tailed Eagle Haliaeetus albicilla, both using lowland forests for breeding.