IntroductionDanube (dănˈyōb) [key], Czech Dunaj, Ger. Donau, Hung. Duna, Rom. Dunarea, Serbo-Croatian and Bulg. Dunav, Ukr. Dunay, great river of central and SE Europe, c.1,770 mi (2,850 km) long, with a drainage basin of c.320,000 sq mi (828,800 sq km); it is second in length only to the Volga among European rivers.
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