Subregions- Alamagan region, Northern Mariana Islands
 - Anatahan region, Northern Mariana Islands
 - Bonin Islands, Japan region
 - Izu Islands, Japan region
 - Mariana Islands region
 - Maug Islands region, Northern Mariana Islands
 - Pagan region, Northern Mariana Islands
 - Rota region, Northern Mariana Islands
 - Saipan region, Northern Mariana Islands
 - Volcano Islands, Japan region
 - west of the Mariana Islands

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