<P> Classified as an international waterway , it originates in the town of Donaueschingen , in the Black Forest of Germany , at the confluence of the rivers Brigach and Breg . The Danube then flows southeast for about 2,800 km ( 1,700 mi ) , passing through four capital cities before emptying into the Black Sea via the Danube Delta in Romania and Ukraine . </P>
where does the danube enter the black sea
via the Danube Delta in Romania and Ukraine