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.“)
Podunavlje
Podunavlje (Serbian: Подунавље / "Podunavlje", ) is the name of the Danube river basin parts located in Serbia (Vojvodina, Belgrade and Eastern Serbia) and Croatia (Slavonia, Syrmia, and Baranja). Podunavlje is located on the southern edge of Pannonian Basin. In its wider meaning, the term is used in Serbian and Croatian as a description for the area around the entire flow of the river Danube.