Individual #Vistula_River__Vistula  a European river; flows into the Baltic Sea
  instance of:  river
  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
        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

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