Danube
Classified as an international waterway, it originates in the town of Donaueschingen, in the Black Forest of Germany, at the confluence of the rivers Brigach and Breg. The Danube then flows southeast for about , passing through four capital cities (Vienna, Bratislava, Budapest and Belgrade) before emptying into the Black Sea via the Danube Delta in Romania and Ukraine.
EV6 The Rivers Route
The EV6 traverses 10 countries from Saint-Nazaire in France at the mouth of the River Loire, eastward along the Loire to the River Saône, across the border to Switzerland, along the Rhine to Lake Constance, north into Germany, down the River Danube and through Austria, Slovakia, Hungary, Serbia, Croatia, Bulgaria, and Romania to the Danube Delta, before terminating at Constanța on the Black Sea.