#boundary_line__border__borderline__delimitation  a line that indicates a boundary
  supertype:  #bounds__boundary  the line or plane indicating the limit or extent of something
  subtype:  #fence_line__fenceline  a boundary line created by a fence
  subtype:  #property_line  the boundary line between two pieces of property
  subtype:  #state_line__stateline__stateboundary  the boundary between two states
     instance:  #Mason-Dixon_Line__Mason_and_Dixon_Line__Mason_and_Dixon's_Line

No statement uses or specializes #boundary_line; click here to add one.