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Beginning in the Black Forest region of Germany, it flows across central Europe and the countries of Austria, Hungary, Croatia and Yugoslavia. It then forms the border between Romania and Bulgaria, turning north across Romania to eventually end in the Black Sea.
It's (1,771 miles) (2,850 km) in length, and one of the most significant commercial waterways on the continent.
Rising in the southwestern part of the Russian Federation, it flows generally south through Belarus, then southeast through Ukraine, ending in the Black Sea. Overall it's (1,420 miles) (2,285 km) in length.
Beginning it the southwestern Russian Federation, to the south of Moscow, it flows southeasterly towards the Volga, then turns abruptly west, ending in the Sea of Azov. Overall it's (1,224 miles) (1,969 km) in length.
Rising in the Czech Republic, the Elbe River then flows north through Germany, ending in the North Sea near Cuxhaven. It's (724 miles) (1,165 km) in length.