The Danube is the second longest river in Europe and the longest river in the European Union. It is formed by the confluence of the Brege and Brigach in the Black Forest (Germany), flows through southern Germany, Austria, Slovakia, Hungary, Serbia, then forms the Romanian-Bulgarian border for many tens of kilometers and empties into the Black Sea on the border between Romania and Ukraine.
The Danube is the second longest river in Europe and the longest river in the European Union. It is formed by the confluence of the Brege and Brigach in the Black Forest (Germany), flows through southern Germany, Austria, Slovakia, Hungary, Serbia, then forms the Romanian-Bulgarian border for many tens of kilometers and empties into the Black Sea on the border between Romania and Ukraine.