Overview
The Danube is the second-longest river in Europe after the Volga, with a length of approximately 2,850 kilometers. It rises in the Black Forest of southwestern Germany and flows eastward through ten countries, more than any other river in the world, before emptying into the Black Sea through its large delta in Romania and Ukraine.
Geography and Physical Features
The Danube passes through Germany, Austria, Slovakia, Hungary, Croatia, Serbia, Romania, Bulgaria, Moldova, and Ukraine, and four national capitals lie on its banks: Vienna, Bratislava, Budapest, and Belgrade. Its drainage basin covers about 800,000 square kilometers. The Iron Gates gorge marks the natural border between Serbia and Romania.
Significance
The Danube has been a crucial trade and travel route since antiquity, forming the northern frontier of the Roman Empire for centuries. Today it remains a major commercial waterway, connected via the Rhine-Main-Danube Canal to the North Sea, allowing transit between the North Sea and Black Sea.
Notable Facts
The Danube Delta, a UNESCO World Heritage Site, is one of Europe's largest and best-preserved wetlands and hosts more than 300 bird species. Johann Strauss II's waltz "The Blue Danube," composed in 1866, helped immortalize the river in classical music.