The Danube (In German: Donau from earlier Danuvius, Celtic *ānu, meaning "to flow, run", Slovak Dunaj, Hungarian Duna, Romanian Dunăre, Old Norse Duná, Turkish Tuna, ancient Greek Istros, Serbo-Croatian Dunav/Дунав, Bulgarian and Macedonian Дунав, Russian Дунай) is the longest river in the European Union and Europe's second longest river after the Volga. It originates in the Black Forest in Germany as the much smaller Brigach and Breg rivers which join at the eponymously named German town Donaueschingen, after which it is known as the Danube and flows eastwards for a distance of some 2850 km (1771 miles), passing through several Central and Eastern European capitals, before emptying into the Black Sea via the Danube Delta in Romania and Ukraine.