Drava or Drave both: drä´və [key], Ger. Drau, Hung. Dráva, river, c.450 mi (720 km) long, rising in the Carnic Alps, N Italy. It flows generally E through S Austria (where it is called the Drau) and enters Slovenia. It forms part of the Croatian-Hungarian border before joining the Danube River E of Osijek. The Mur River is its chief tributary. The lower course of the Drava is navigable.
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