Supply Reef is a submerged circular reef of volcanic origin in the Northern Mariana Islands chain, about 10 kilometres (6 mi) NW of the Maug Islands. Presently, this igneous seamount is roughly 8 metres (26 ft) below the ocean's surface and about 100 m (300 ft) in diameter. Apparent episodes of submarine volcanism were noted on December 22–24 and 26–27 in 1989.

Key Information

Supply Reef
Location within Northern Mariana Islands Show map of Northern Mariana Islands Location within North Pacific Show map of North Pacific
Summit depth	−8 m (−26 ft)
Location
Location	Northern Mariana Islands
Coordinates	20°08′N 145°6′E / 20.133°N 145.100°E / 20.133; 145.100
Country	United States
Geology
Type	Submarine volcano
Last eruption	September to December 1989
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Volcanic and seismic activity has been noted, as well as hard and soft corals.^[1]

• "Supply Reef". Global Volcanism Program. Smithsonian Institution. Retrieved 2017-03-03.

1. ^ "Commonwealth of Northern Mariana Islands (CNMI) and Guam – Pacific Islands Benthic Habitat Mapping Center". Retrieved 2023-10-21.

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