The NW division of Oceania, which includes the Mariana, Caroline, Marshall, and Kiribati island groups, and Nauru Island (10)

I believe the answer is:

micronesia

(Other definitions for micronesia that I've seen before include "Western Pacific island group" , "Pacific lands" , "somewhere in Pacific" , "Group of Pacific islands" , "a far-off place" .)

I've seen this clue in The Independent.

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