Individual #Olduvai_Gorge  a gorge in northeastern Tanzania where anthropologists have found some of the earliest human remains
  instance of:  gorge
  part of:  Tanzania__United_Republic_of_Tanzania  a republic in eastern Africa
     part of:  Africa  the second largest continent; located south of Europe and bordered to the west by the South Atlantic and to the east by the India Ocean
        part of:  eastern_hemisphere__easternhemisphere__orient  the hemisphere that includes Eurasia and Africa and Australia

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