
The river was known to the ancient Greeks as the Istros ( Ἴστρος) a borrowing from a Daco-Thracian name meaning 'strong, swift', from a root possibly also encountered in the ancient name of the Dniester ( Danaster in Latin, Tiras in Greek) and akin to Iranic turos 'swift' and Sanskrit iṣiras ( इषिरस्) 'swift', from the PIE * isro-, * sreu 'to flow'.

The fourth-largest city in its basin is Munich, the capital of Bavaria, standing on the Isar River. Five more capital cities lie in the Danube's basin: Bucharest, Sofia, Zagreb, Ljubljana and Sarajevo. The Danube passes through four capital cities, more than any other river in the world. The largest cities on the river are Vienna, Budapest, Belgrade and Bratislava, all of which are the capitals of their respective countries. Its drainage basin extends into nine more countries. Originating in Germany, the Danube flows southeast for 2,850 km (1,770 mi), passing through or bordering Austria, Slovakia, Hungary, Croatia, Serbia, Romania, Bulgaria, Moldova and Ukraine before draining into the Black Sea. j uː b/ DAN-yoob known by various names in other languages) is a river that was once a long-standing frontier of the Roman Empire and today connects 10 European countries, running through their territories or being a border. Waterway distances are shown, not towpath distances.


Distances are in kilometers, rounded to the nearest kilometer.
