#zone  an area or region distinguished from adjacent parts by a distinctive feature or characteristic
  supertype:  region.location__part  the extended spatial location of something; "the farming regions of France"; "religions in all parts of the world"; "regions of outer space"
  subtype:  zona__zone  (anatomy) any encircling or beltlike structure
     subtype:  zona_pellucida  thick membrane around the mammalian ovum; can be penetrated by one sperm in the fertilization process; usually remains around the fertilized egg until it is implanted in the wall of the uterus
     subtype:  zonule__zonula  small beltlike zone
  subtype:  combat_zone  a military area where combat forces operate
     subtype:  beachhead__bridgehead__foothold  an area in hostile territory that has been occupied and is held for further troops and supplies
  subtype:  danger_zone  a dangerous area
  subtype:  drop_zone__dropping_zone  an agreed area where military supplies are dropped to ground troops
  subtype:  tidal_zone__tidalzone  an area subject to tidal action

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