#highland__upland  elevated (e.g., mountainous) land
  exclusion:  lowland
  supertype:  natural_elevation__naturalelevation__elevation  a raised or elevated geological formation
  instance:  Highlands
  subtype:  down.highland  (usually plural) a rolling treeless highland with little soil
  subtype:  tableland__plateau  a relatively flat highland
     subtype:  Colorado_Plateau  a large plateau south and west of the Rocky Mountains; abuts mountains on the north and east and ends in an escarpment overlooking lowlands to the south and west; the Grand Canyon of the Colorado River is carved out of the southwestern corner
     subtype:  Llano_Estacado  a large semiarid plateau forming the southern part of the Great Plains
     subtype:  mesa__table  flat tableland with steep edges; "the tribe was relatively safe on the mesa but they had to descend into the valley for water"
     subtype:  terrace__bench  a level shelf of land interrupting a declivity (with steep slopes above and below)
     instance:  Ardennes

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