Danube

The Danube (/ˈdænjuːb/ DAN-ewb, also known as Donau or Danubio) is Europe's second-longest river, after the Volga River, and also the longest river in the European Union region. It is located in Central and Eastern Europe.

The Danube was once a long-standing frontier of the Roman Empire, and today flows through 10 countries. Originating in Germany, the Danube flows southeast for 2,860 km (1,780 mi), passing through or touching the border of Austria, Slovakia, Hungary, Croatia, Serbia, Romania, Bulgaria, Moldova and Ukraine before emptying into the Black Sea. Its drainage basin extends into nine more countries.

Names and etymology

The Latin name Dānuvius is one of a number of "Old European" river names derived from a Proto-Indo-European *dānu. Other river names from the same root include the Don, Donets, Dzvina/Duna, Dysna, Dnieper and Dniestr. In Rigvedic Sanskrit, dānu means "fluid, drop", in Avestan, the same word means "river". In the Rigveda, Dānu once appears as the mother of Vrtra. It is possible that dānu in Scythian as in Avestan was a generic word for "river": Dniepr and Dniestr, from Danapris and Danastius, are presumed to continue Scythian *dānu apara "far river" and *dānu nazdya- "near river", respectively.