The river Danube has a surface of approximately 725.985 km ². The Danube crosses Europe from west to east.The river and his course includes parts of Germany, Austria, Slovakia, Hungary, Croatia, Serbia, Romania, Bulgaria, Moldavia and Ukraine. The basin of the Danube spreads in addition over the Czech Republic, Switzerland, Slovenia, Bosnia and Herzegovina and Montenegro.
Approximately 60 of his 300 tributaries are navigable.
It is the Europe's second longest river, after the Volga. It is born in the Black Jungle of Germany,with the union of two small rivers, the Brigach and the Breg.
It is navigable, raising the current from the Black Sea, for ships Transatlantic up to Bräila (Romania) and for fluvial crafts up to the city of Ulm (Germany), to a distance of approximately 2.575 km.
It is navigable, raising the current from the Black Sea, for ships Transatlantic up to Bräila (Romania) and for fluvial crafts up to the city of Ulm (Germany), to a distance of approximately 2.575 km.
The Danube flows through important cities as Ulm, Ingolstadt and Regensburg in Germany; Linz and Vienna in Austria; Bratislava in Slovakia; Budapest.
| Length(Km) | Right side | Both sides | Left side | ||||
| Country | km | % | km | % | km | % | |
| Germany | 687,00 | 658,6 | 23 | 658,6 | 36 | 687,0 | 24 |
| Austria | 357,50 | 357,5 | 12 | 321,5 | 18 | 321,5 | 11 |
| Slovakia | 172,06 | 22,5 | 1 | 22,5 | 1 | 172,1 | 6 |
| Hungary | 417,20 | 417,2 | 14 | 275,2 | 15 | 275,2 | 10 |
| Croatia | 137,50 | 137,5 | 5 | 0,0 | 0 | 0,0 | 0 |
| Serbia | 587,35 | 449,9 | 16 | 220,5 | 12 | 358,0 | 12 |
| Romania | 1.075,00 | 374,1 | 13 | 319,6 | 18 | 1.020,5 | 35 |
| Bulgaria | 471,55 | 471,6 | 16 | 0,0 | 0 | 0,0 | 0 |
| Moldavia | 0,57 | 0,0 | 0 | 0,0 | 0 | 0,6 | 0 |
| Ukraine | 53,94 | 0,0 | 0 | 0,0 | 0 | 53,9 | 2 |
