210-square-mile U.S. territory (4)

I believe the answer is:

guam

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

I've seen this clue in The Wall Street Journal.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.