#tableland__plateau  a relatively flat highland
  supertype:  highland__upland  elevated (e.g., mountainous) land
  instance:  Ardennes
  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)

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