The Enns River
At 254 km length, the Enns, which has its source in the Radstätter Tauern mountains and flows into the Danube near Enns, is the longest river entirely within Austria.
The Enns, a 254 km long southern tributary of the Danube and the main river in northwest Styria, is a typical whitewater river of the northern Eastern Alps and has the fifth-largest catchment area in Austria (6080 km2).