Colorado's __ Verde National Park (4)

I believe the answer is:

mesa

(Other definitions for mesa that I've seen before include "In the US south-west, a steep-sided flat-topped hill" , "In the USA, a steep-sided flat-topped hill" , "Flat hill" , "High land" , "Flat-topped hill with steep sides, common in the southwestern US" .)

I've seen this clue in the LA Times.

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