Danube
 The Danube (/ˈdænjuːb/ DAN-ewb Ister in Ancient Greek) is a river in Central and Eastern Europe the European Union's longest and the continent's second longest (after the Volga).Classified as an international waterway it originates in the town of Donaueschingen—which is in the Black Forest of Germany—at the confluence of the rivers Brigach and Breg.