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              The "Blue Danube River" and distant Austrian Castle 
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              The Danube is Europe's second longest river and one of the 
              principal traffic arteries on the continent. It is the only major 
              European river to flow from west to east. It rises in the Black 
              Forest region of Germany and flows in a generally easterly 
              direction, emptying on the Romanian coast into the Black Sea. The 
              delta of the Danube is a region of desolate marshes and swamps, 
              broken by tree-covered elevations. Important cities on the river 
              include Linz and Vienna, in Austria; Ulm, Regensburg, and Passau, 
              in Germany; Bratislava, Slovakia; Budapest, Hungary; Belgrade, 
              Serbia; and Galati and Bràila, in Romania. Canals link the Danube 
              to the Main, Rhine, and Oder rivers. The Danube Valley between 
              Linz and Vienna, Austria, (as seen in this photo) is noted for its 
              beautiful scenery. 
  
            
              
              
              The Danube has always been an important route between western 
              Europe and the Black Sea.  It served as an artery for the 
              Crusaders into Byzantium (Constantinople) and from there to the 
              Holy Land.  Later, beginning at the end of the 14th century it 
              helped the Ottoman Turks gain access to western and central 
              Europe. In the 19th century it became an essential link between 
              the growing industrial centers of Germany and the agrarian areas 
              of the Balkans. 
             
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