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"The Danube river is an international waterway, It starts in Germany and flows through Austria, Hungary, Romania, Moldova, Croatia, Serbia and Slovakia as well as Bulgaria and the Ukraine. The Danube river originates in the Black Forest, and empties into the Black sea."
Kind of hard to define because of it's many tributaries and the fact that it is the border of many countries.

- Germany, Austria, Czech Republic, Slovakia, Hungary, Serbia, Romania and Bulgaria.

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10y ago

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