<P> The Latin name is masculine, as are all its Slavic names (the name of the Rhine is also masculine in Latin, most of the Slavic languages, as well as in German). The German Donau (Early Modern German Donaw, Tonaw, Middle High German Tuonowe) is feminine, as it has been re-interpreted as containing the suffix - ouwe "wetland". </P> <P> The modern languages spoken in the Danube basin all use names related to Dānuvius: German: Donau ((ˈdoːnaʊ̯); Bavarian: Doana; Yiddish: Dunay דונײַ ‎ (dʊnaj)); Silesian: Důnaj; Upper Sorbian: Dunaj; Slovak: Dunaj ((ˈdunaj)); Hungarian: Duna ((ˈdunɒ)); Serbo - Croatian: Dunav / Дунав ((dǔnaʋ) or (dǔnaːʋ) Romanian: Dunărea ((ˈdunəre̯a)); Romani: Dunaja ((ˈdunaja)); Bulgarian: Дунав, Dunav ((ˈdunɐf)); Ukrainian: Дунай, Dunai ((duˈnɑj)); Czech: Dunaj (Czech pronunciation: (ˈdʊnaj)); Polish: Dunaj (Polish pronunciation: (ˈdũnaj)); Slovene: Donava ((ˈdóːnaʋa)); Italian: Danubio ((da'nubjo)); Romansh: Danubi . </P> <P> Classified as an international waterway, it originates in the town of Donaueschingen, in the Black Forest of Germany, at the confluence of the rivers Brigach and Breg . The Danube then flows southeast for about 2,800 km (1,700 mi), passing through four capital cities before emptying into the Black Sea via the Danube Delta in Romania and Ukraine . </P> <P> Once a long - standing frontier of the Roman Empire, the river passes through or touches the borders of 10 countries: Romania (29.0% of basin area), Hungary (11.6%), Serbia (10.2%), Austria (10.0%), Germany (7.0%), Bulgaria (5.9%), Slovakia (5.9%), Croatia (4.4%), Ukraine (3.8%), and Moldova (1.6%). Its drainage basin extends into nine more . </P>

Where does the danube enter the black sea