How many countries does the Danube River passing through or bordering?

The Danube river (known by various names in other languages) is Europe's second longest river, after the Volga. It is located in Central and Eastern Europe. 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. Its drainage basin extends into nine more countries.