|Summit depth||−8 m (−26 ft)|
|Pronunciation||Northern Mariana Islands, United States|
|Last eruption||September to December 1989|
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.
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