Individual #Po_River__Po  a European river; flows into the Adriatic Sea
  instance of:  river
  part of:  Italy__Italian_Republic__Italia  a republic in southern Europe on the Italian Peninsula; was the core of the Roman Republic and the Roman Empire between the 4th century BC and the 5th century AD
     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:  Mediterranean_region

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