
19/06/2025
The Danube is the second-longest river in Europe, after Russia’s Volga. It flows through Central and Southeastern Europe, beginning in Germany’s Black Forest and emptying into the Black Sea.
Historically significant, the Danube once served as a frontier of the Roman Empire. Today, it connects ten countries—either flowing through them or forming part of their borders—including Germany, Austria, Slovakia, Hungary, Croatia, Serbia, Romania, Bulgaria, Moldova, and Ukraine. Spanning 2,850 kilometers (1,770 miles), the river passes through four national capitals: Vienna, Bratislava, Budapest, and Belgrade. Its drainage basin covers about 817,000 square kilometers (315,000 square miles) and reaches into nine additional countries.