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.
Source of the Danube
The spring of the river Breg is situated in the north of Furtwangen next to the St. Martin's Church near the Kolmenhof (restaurant). The Breg is for geographical and hydrological reasons longer and has a bigger water flow than the Brigach which is why its spring is the main origin of the upper Danube. The dominance of the Breg is established by the following data: