Ata Caldera

About

Ata Caldera (Ata karudera), containing the Ata North Caldera (AtaN Caldera), and the Ata South Caldera (AtaS Caldera), which in turn contains Mount Kaimon and Ikeda Caldera amongst other volcanoes, is a massive, ill defined, mostly submerged volcanic caldera structure associated with the southern portions of Kagoshima Bay.

Adapted from Wikipedia (CC BY-SA). Photography via Wikimedia Commons.