Source of the Danube 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.“) The identification of the main spring in the uppermost Bregtal (also called Katzensteig) is dependent on a defining convention: Instead of
Nazi rule over the Danube River the river, stretching from Mohács in southern Hungary all the way to the Black Sea. Another suggested turning Belgrade into a fortress-city of the Reich ("Reichsfestung") and the center of a "Reichsgau" (administrative subdivision), to be named Prinz-Eugen. Neither of these ideas was officially endorsed by the wartime German government, however, and the historical record indicates that the Nazis had no clear conception as to what extent Germany should control the Danube or how this control was to be effected. Hitler's own preference, at least for the immediate future, was the retention of a number of satellite states (Hungary, Romania,