DRAVE or DRAVA (Ger. Drau), one of the principal right bank affluents of the Danube. It rises below the Innichner Eck, in Tirol, at an altitude of over 4,00o ft., runs eastward, and forms the longest longitudinal valley of the Alps, the Drau Thal. The Drave is 45o m. long; near Zakkany it is joined by the Mur. The valley of the Drave was the chief road through which the invad ing peoples of the East, such as the Huns, the Slays and the Turks penetrated the Alpine countries. The Drave flows through Carin thia and Styria, and forms the boundary between Hungary and Yugoslavia from Varazdin to near Osijek. At its mouth the Drave attains a breadth of I,o55 ft. and a depth of 20 ft. The Drave is navigable for rafts only from Villach, and for river steamers from Barcs, a distance of 95 m. The principal towns on the Drave and its affluents are Klagenfurt, Graz, Maribor and Osijek. (See DANUBE.)