The Enns is a southern tributary of the river Danube, joining northward at Enns, Austria. The Enns River spans 253 kilometres, in a flat-J-shape. It flows from its source near the village Flachau, generally eastward through Radstadt, Schladming, and Liezen, then turns north near Hieflau, to flow past Weyer and Ternberg through Steyr, and further north to the Danube at Enns.