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.

Supply Reef
Northern Mariana Islands Show map of Northern Mariana Islands Supply Reef (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
Country	United States
Geology
Type	Submarine volcano
Last eruption	September to December 1989

References

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

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