Territory near the Mariana Trench (4)

I believe the answer is:

guam

(Other definitions for guam that I've seen before include "place in the Marianas" , "US island east of the Philippines" , "NW Pacific island with large US base" , "US unincorporated territory in the western Pacific" , "Island in the West Pacific" .)

I've seen this clue in the LA Times.

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