The Danube is Europe’s second-longest river, after the Volga River, and also the longest river in the European Union region. It is located in Central and Eastern Europe. The Danube was once a long-standing frontier of the Roman Empire, and today flows through 10 countries. Originating in Germany, the Danube flows southeast for 2,860 km (1,780 mi), passing through or touching the border of Austria, Slovakia, Hungary, Croatia, Serbia,Romania, Bulgaria, Moldova and Ukraine before emptying into theBlack Sea. Its drainage basin extends into nine more countries. Danube River is a bridge between Middle Europe – South Germany and ports of the World.
The Volga is the longestriver in Europe; it is also Europe’s largest river in terms ofdischarge and watershed. It flows through central Russia and into the Caspian Sea, and is widely viewed as the national river of Russia. Eleven of the twenty largest cities of Russia, including the capital,Moscow, are in the Volga’s watershed (drainage basin).