#field.geographical_area  a geographic region (land or sea) under which something valuable is found; "the diamond fields of South Africa"
  supertype:  #geographical_area__geographic_area__geographical_region__geographic_region  a demarcated area of the Earth
  subtype:  #coalfield  a region where there is coal underground
  subtype:  #gasfield  a region where there is natural gas underground
  subtype:  #oilfield  a region rich in petroleum deposits (especially one with producing oil wells)

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