Danube (German Donau), second longest river in Europe. Beginning in the Black Forest region of Germany, it flows across central Europe and the countries of Austria, Hungary, Croatia and Yugoslavia. It then forms the border between Romania and Bulgaria, turning north across Romania to eventually end in the Black Sea. It's (1,771 miles) (2,850 km) in length, and one of the most significant commercial waterways on the European continent.
The only known river Windsurfing sites are located in the Vienna area in Austria.
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