Individual #Irtish_River__Irtish__Irtysh__Irtysh_River  an Asian river; tributary of the Ob River
  instance of:  river
  part of:  Siberia  a vast Asian region of Russia; famous for long cold winters
     part of:  Russia__Russian_Federation  a federation in northeastern Europe and northern Asia; formerly Soviet Russia; since 1991 an independent state
        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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