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.
Kleine Donau (Ilm)
Kleine Donau is a river of Bavaria, Germany. Originally a branch of the Danube, it does not receive water from the Danube anymore. It starts at the confluence of the Wellenbach and the "Flutkanal Kleine Donau", a branch of the Ilm, near Vohburg. It flows into the Danube near Pförring.