The two best-known features of the Austrian landscape are the Alps and the Danube River. The Danube has its source in southwestern Germany and flows through Austria before emptying into the Black Sea. It is the only major European river that flows eastward, and its importance as an inland waterway has been enhanced by the completion in 1992 of the Rhine-Main-Danube Canal in Bavaria, which connects the Rhine and Main rivers with the Danube and makes possible barge traffic from the North Sea to the Black Sea.

The major rivers north of the watershed of the Austrian Alps (the Inn in Tirol, the Salzach in Salzburg, and the Enns in Styria and Upper Austria) are direct tributaries of the Danube and flow north into the Danube Valley, whereas the rivers south of the watershed in central and eastern Austria (the Gail and Drau rivers in Carinthia and the M�rz and Mur rivers in Styria) flow south into the drainage system of the Drau, which eventually empties into the Danube in Serbia. Consequently, central and eastern Austria are geographically oriented away from the watershed of the Alps: the provinces of Upper Austria and Lower Austria toward the Danube and the provinces of Carinthia and Styria toward the Drau.