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.
Lauchert
The Lauchert is a river in Baden-Württemberg, Germany, left tributary of the Danube. Its source is near Sonnenbühl, in the Swabian Alb. It is approx. 60 km long. It flows generally south through the small towns Gammertingen, Veringenstadt and Bingen. It flows into the Danube in Sigmaringendorf.