The Danube (Donau in German) is the second longest river in Europe (after the Volga). It rises in Germany's Black Forest and flows southeast, through Ingolstadt and Regensburg, into Austria and through Vienna, and to the Black Sea. It flows through the countries of Germany, Austria, Hungary, Serbia, and Romania and borders Slovakia, Croatia, Bulgaria, and Ukraine.
The Danube River drains an area of about 320,300 square miles (829,580 square kilometers) and has a total length of 1,770 miles (2,850 kilometers).
Its course can be divided into three parts. The upper course from its source to Vienna, stretches eastward through the hills of southern Germany and Austria. Its middle course runs from Vienna to the Iron Gate gorges on the border of Serbia and Romania, and it flows across lowlands and through mountain ridges. The lower course lies across the plain of Romania and Bulgaria, but before it reaches the Black Sea it swings to the north, turns again to the east, and divides into the many channels of the delta.
The Danube has long been an an important transport route for trade between central and Eastern Europe.
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