The Pannonian Region is a large alluvial basin surrounded by the Carpathian Mountains to the north and east, the Alps to the west and the Dinaric Alps to the south.

It is flat, and is crossed from north to south by the Danube and Tisza rivers.

The region contains all of Hungary, and around the periphery contains parts of Slovakia, the Czech Republic, Romania, Serbia, Croatia, Bosnia and Herzegovina and Ukraine.

The basin was once largely forested, with many marshes and shallow lakes, but has long been cleared and drained to make way for grasslands and cultivation.

It contains inland sand dunes, sand steppes, loess grasslands and maple-oak loess forests.,[2] and significantly overlaps with the Pannonian mixed forests ecoregion.