Individual #Oder_River__Oder  a European river; flows into the Baltic Sea
  instance of:  #river
  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:  #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:  #Poland__Republic_of_Poland__Polska  a republic in central Europe; the invasion of Poland by Germany in 1939 started World War II
     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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