Mariana Islands | Pacific Islands, US Territory | Britannica
https://www.britannica.com/place/Mariana-Islands
WebApr 9, 2024 · Mariana Islands, island arc, a series of volcanic and uplifted coral formations in the western Pacific Ocean, about 1,500 miles (2,400 km) east of the Philippines. They are the highest slopes of a massive undersea mountain range, rising some 6 miles (9.5 km) from the Marianas Trench in the ocean.
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