<Tr> <Th> Brigach </Th> <Td> 3.37 m / s </Td> <Td> 195 km </Td> <Td> 40.2 km </Td> <Td> 940 m </Td> </Tr> <Tr> <Th> Breg </Th> <Td> 5.95 m / s </Td> <Td> 291.2 km </Td> <Td> 45.9 km </Td> <Td> 1078 m </Td> </Tr> <P> 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. ") </P> <P> The identification of the main spring in the uppermost Bregtal (also called Katzensteig) is dependent on a defining convention: Instead of localizing the main spring in Gewann Briglirain (also called Brücklerain) it is, because of length and drainage measurements from the 1950s, localized at the Martinskapelle in Gewann today . This part of the river carries more water and has a bigger drainage but partly trickles away, especially in dry weather conditions, into the rubble at the bottom of the valley . This is no concern for the choice of this part of the river but for the height of the spring as a perennial outflow . </P>

Which country is the source of the river danube