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.
Upper Danube Nature Park
The Upper Danube Nature Park (German: "Naturpark Obere Donau"), founded in 1980, is located in the south of Baden-Württemberg in Germany and encloses primarily the districts of Tuttlingen and Sigmaringen. It encompassed initially 860 km that were increased by about 500 km in 2005. The headquarters of the nature reserve association is at Beuron. The highest proportion of the nature park is taken up by the Heuberg, the south-western plateau of the Swabian Alb, and is punctuated by the Danube.