Source of the Danube
As early as 1847 the following definition can already be found in the "Universallexikon des Großherzogtums Baden" (Universal Lexicon of the Grand Duchy of Baden): “Danube, the biggest river of Germany, rises at the Martinskapelle in a wild and lonely area of the Black Forest, is called Brege at its origin and forms the river Danube in Donaueschingen where it is unified with the Brigach." (German original: „Donau, der größte Fluß Deutschlands, entspringt bei der Martinskapelle in einer wilden und einsamen Gegend des Schwarzwaldes, heißt am Anfang Brege… und bildet erst in Donaueschingen, wo sie sich mit der Brigach vereinigt, die Donau.“)
Kammel
The Kammel is a river in Bavaria, southern Germany. The Kammel originates west of Mindelheim, in the district Unterallgäu, and flows generally north. It flows into the Mindel (left tributary) south of "Offingen at the Danube", east of Günzburg in the district Günzburg. So it is an indirect right tributary of the Danube. The difference in altitude between the origin and the mouth is 265 m.