List of tributaries of the Danube
The Danube is Europe's second-longest river. It starts in the Black Forest in Germany as two smaller rivers—the Brigach and the Breg—which join at Donaueschingen, and it is from here that it is known as the Danube, flowing generally eastwards for a distance of some , passing through several Central and Eastern European capitals, before emptying into the Black Sea via the Danube Delta in Romania.
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"):