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.
Schwarze Laber
The Schwarze Laber is a river in Bavaria, Germany, and a left tributary of the Danube. Its source is near Neumarkt in der Oberpfalz. It is approx. 78 km long. It flows southeast through the small towns Parsberg, Beratzhausen, Laaber and Deuerling. It flows into the Danube in Sinzing.