Pannonian Basin

The Pannonian Basin or Carpathian Basin is a large basin in Central Europe. The geomorphological term Pannonian Plain is more widely used for roughly the same region though with a somewhat different sense, with only the lowlands, the plain that remained when the Pliocene Epoch Pannonian Sea dried out.

It is a geomorphological subsystem of the Alps-Himalaya system. Most of the plain consists of the Great Hungarian Plain (in the south and east, including the Eastern Slovak Lowland) and the Little Hungarian Plain (in the northwest), divided by the Transdanubian Mountains.

The Pannonian Basin lies in the southeastern part of Central Europe, or at the boundary between Central, Eastern and Southeastern Europe (Balkans). It forms a topographically discrete unit set in the European landscape, surrounded by imposing geographic boundaries - the Carpathian Mountains, the Alps, the Dinarides and the Balkan mountains. The Rivers Danube and Tisza divide the basin roughly in half. It extends roughly between Vienna in the northwest, Zagreb in the southwest, Belgrade in the southeast and Satu Mare in the northeast.

...
Wikipedia