Mesa Verde National Park sight (6)

I believe the answer is:

canyon

(Other definitions for canyon that I've seen before include "gully" , "The Grand . . . . . . of Colorado is a natural phenomenon in USA" , "Deep valley with steep, even Grand, slopes" , "A deep gorge with a river, may be Grand" , "Big rift" .)

I've seen this clue in the USA Today.

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