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.
Vils (Danube)
The Vils is formed by the confluence of its two source rivers, the Kleine Vils and the Große Vils, in Gerzen. It is long ( including "Große Vils"). It flows east through a rural area with small towns, including Aham, Frontenhausen, Marklkofen, Reisbach, Eichendorf and Aldersbach. It flows into the Danube in Vilshofen.