Inamba-jima

Inamba-jima (藺灘波島 or イナンバ島) is a volcanic, deserted island located in the Philippine Sea approximately 220 km south of Tokyo and 35 km southwest of Mikura-jima, in the center of the Izu archipelago, Japan.

Geography
The island is an andesite pillar with sheer sides, the only visible portion of a submarine volcanic caldera. The above sea-level portion has a surface area of approximately 0.005 square kilometers, with a summit height of 74 m. Located in the Kuroshio Current, the area has abundant sea life, and is popular with sports fishermen and scuba divers.