(German *Drav*), a river in the Austrian dominions, one of the principal affluents of the Danube. It rises on what is called the Toblachheath in the Pusterthal of Tyrol, not far from Innichen, and after a course of nearly 400 miles falls into the Danube some miles E. of Eszec. It flows at first E.N.E. to Linz, where it receives the Isel; thence its course is generally E.S.E., passing through Carinthia and Styria, and afterwards forming the boundary between Croatia and Sclavonia on the S. and Hungary on the N. The principal towns on its banks are Linz, Villach, Marburg, Pettan, and Fridau. Its principal affluents are, on the left, the Isel, Misl, Liser, Gurk, Lavant, and Mur; and on the right the Gail. Its course is rapid; and its bed, though rocky, is navigable for flat-bottomed boats to Villach.