#coastal_plain__coastalplain  a plain adjacent to a coast
  supertype:  #dry_land__dryland__land__earth__solid_ground__solidground__terrafirma  the solid part of the earth's surface; "the plane turned away from the sea and moved back over land"; "the earth shook for several minutes"; "he dropped the logs on the ground"
  subtype:  #tidewater  low-lying coastal land drained by tidal streams

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