Shefa Province, Vanuatu
Vulcan undersea Volcano is located between Efate Island and Erromango Island.
Further reading
Monzier, Michel, et al. "Geochemistry vs. seismo-tectonics along the volcanic New Hebrides central chain (Southwest Pacific)." Journal of volcanology and geothermal research 78.1-2 (1997): 1-29.
Vulcan seamount has erupted in the past 300,000 years.