The Danube is Europe's second longest river, after the Volga. It is located in Central and Eastern Europe, flowing through 10 countries. The river originates in Germany's Black Forest and flows southeast for 2.860 km (1780 mi), passing through Austria, Slovakia, Hungary, Croatia, Serbia, Romania, Bulgaria, Moldova and Ukraine before draining into the Black Sea. It is known as the most biodiverse region in Europe and is home to 5000 species of animals, birds, and plants. The Danube used to serve as a long-standing frontier of the Roman Empire and was also the site of some of the earliest human settlements in Europe. Nowadays the International Commission for the Protection of the Danube River ensures the conservation and maintenance of the river's natural heritage.
Photographer: Anna Armbrust