Oahu, Hawaii
21.35 N, 157.80 W
summit elevation 530 m
Monogenetic volcanic field Honolulu Vents consists of 40 scattered vents super-imposed on the eastern side of Koolau volcano.
Further reading
Yang, H-J., F. A. Frey, and D. A. Clague. "Constraints on the source components of lavas forming the Hawaiian North Arch and Honolulu Volcanics." Journal of Petrology 44.4 (2003): 603-627.
Possible Holocene eruptions of Honolulu Vents.