The Danube is an international waterway vital to the centuries until today. In history been a major stronghold of the Roman Empire. The Danube flows through the line territory of 10 countries, including Germany, Austria, Slovakia, Hungary, Croatia, Serbia, Bulgaria, Romania, Moldova, Ukraine, and also depression support from many countries, including Italy, Poland, Switzerland. Switzerland Czech Republic, Slovenia, Bosnia and Herzegovina, Montenegro, Republic of Macedonia, Moldova and Albania.
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