Individual #Danube_River__Danube  the 2nd longest European river; flows into the Black Sea
  instance of:  #river
  part of:  #Bulgaria__Republic_of_Bulgaria  a republic in the eastern part of the Balkan Peninsula in southeastern Europe
     part of:  #Europe  the 2nd smallest continent (actually a vast peninsula of Eurasia); the British use `Europe' to refer to all of the continent except the British Isles
        part of:  #Eurasia  the land mass formed by the continents of Europe and Asia
           part of:  #eastern_hemisphere__easternhemisphere__orient  the hemisphere that includes Eurasia and Africa and Australia
           part of:  #northern_hemisphere  the hemisphere north of the equator
  part of:  #Czechoslovakia  a former republic in central Europe; divided into Czech Republic and Slovakia in 1993
     part of:  #Europe  the 2nd smallest continent (actually a vast peninsula of Eurasia); the British use `Europe' to refer to all of the continent except the British Isles
  part of:  #Germany__Federal_Republic_of_Germany__Deutschland__FRG  a republic in central Europe; split into East German and West Germany after World War II and reunited in 1990
     part of:  #Europe  the 2nd smallest continent (actually a vast peninsula of Eurasia); the British use `Europe' to refer to all of the continent except the British Isles
  part of:  #Romania__Roumania__Rumania  a Balkan republic in southeastern Europe
     part of:  #Europe  the 2nd smallest continent (actually a vast peninsula of Eurasia); the British use `Europe' to refer to all of the continent except the British Isles
  part of:  #Yugoslavia__Federal_Republic_of_Yugoslavia__Jugoslavija__Serbia_and_Montenegro  a mountainous republic in southeastern Europe
  part of:  #Austria__Republic_of_Austria__Oesterreich  a mountainous republic in central Europe; under the Hapsburgs (1278-1918) Austria maintained control of the Holy Roman Empire and was a leader in European politics until the 19th century
     part of:  #Europe  the 2nd smallest continent (actually a vast peninsula of Eurasia); the British use `Europe' to refer to all of the continent except the British Isles
  part of:  #Hungary__Republic_of_Hungary__Magyarorszag  a republic in central Europe
     part of:  #Europe  the 2nd smallest continent (actually a vast peninsula of Eurasia); the British use `Europe' to refer to all of the continent except the British Isles
  part of:  #Ukraine__Ukrayina  a republic in southeastern Europe; formerly a European Soviet; the center of the original Russian state which came into existence in the ninth century
     part of:  #Europe  the 2nd smallest continent (actually a vast peninsula of Eurasia); the British use `Europe' to refer to all of the continent except the British Isles

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