The 2,850 km-long Danube kicks off in Germany's Black Forest and flows eastward through 10 countries to the Black Sea. Once part of the Roman Empire's border against barbarian hordes to the northand of...
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The 2,850 km-long Danube kicks off in Germany's Black Forest and flows eastward through 10 countries to the Black Sea. Once part of the Roman Empire's border against barbarian hordes to the northand of...