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.
Lower Danube Circle
The Lower Danube Circle or Under Danube Circle () was one of the administrative districts (German: "Bezirke" or "Regierungsbezirke") of the Kingdom of Bavaria between 1806 and 1837. It was named after its main river, the Danube and was the predecessor of the administrative district of Lower Bavaria ("Regierungsbezirk Niederbayern"). Its administrative headquarters were in Passau, but the appelate court was in Straubing.The district was divided in the following judicial districts ("Landgerichte"), according to the original borders of the districts of the former territories ("Herrschaftsgerichte"):