Downstream of this river's source in the Black Forest, a canal heads northward from it, effectively creating a transcontinental waterway from the (*) Rhine's watershed through cities like Bratislava.
Great War Island lies in this river as it flows through a national capital, upstream of its intersection with the Jiu River. After draining the Pannonian Basin, it travels through a gorge called the Iron Gates, while near its beginning, Ulm lies on its banks. Downstream of this river's source in the Black Forest, a canal heads northward from it, effectively creating a transcontinental waterway from the (*) Rhine's watershed through cities like Bratislava. This river divides the former cities of Buda and Pest, now united as Hungary's capital, and also bisects Belgrade. For 10 points, name this long European River which passes through Vienna on its way to the Black Sea.
Great War Island lies in this river as it flows through a national capital, upstream of its intersection with the Jiu River.
Danube River [or Fluss Donau; or Rieka Dunaj; or Duna Folyó; or Rijeka ("REE-yay-kah") Dunav; or Ryeka Dunav; or Rau ("roo") Dunarea; or Ruchky Dunai]