The Danube flows through Budapest and is the second-longest river in Europe.
The river rises in Germany’s Black Forest region and travels eastward through or along the borders of ten countries before reaching the Black Sea. No other river flows through as many countries. Budapest, Hungary’s capital, is divided by the Danube into the historic Buda and Pest sides, which were united as one city in 1873.
The Danube has supported trade, settlement, agriculture, and military movement for thousands of years. Ancient Roman forts and roads followed sections of its course, while later kingdoms used the river as a political and commercial corridor. Its watershed covers a large part of central and southeastern Europe.
The Volga is Europe’s longest river, so it is a common answer mix-up. The Danube is about 2,850 kilometers long and empties into the Black Sea through a major delta shared by Romania and Ukraine.