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.
Lauter (Danube)
The Lauter, also: "Große Lauter", is a small river of the Swabian Alb, Baden-Württemberg, Germany. Its Karst spring is inside the walls of the former nunnery at "Offenhausen", a small settlement near Gomadingen. The river discharges into the Danube after 42 km. The river has a long geological history since late Miocene. Although the Swabian Alb is heavily karstified, this river's water runs aboveground all the way.