#landmark.reference_point  a mark showing the boundary of a piece of land
  supertype:  #reference_point__referencepoint__point_of_reference__reference  an indicator that orients you generally; "it is used as a reference for comparing the heating and the electrical energy involved"
  subtype:  #merestone__meerestone__mearstone  an old term for a landmark that consisted of a pile of stones surmounted by an upright slab

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