[1] A deserted volcanic island, it is located just off the northern shore of Iōjima, Kagoshima.

The island is an exposed lava dome associated with the submarine Kikai Caldera, a stratovolcano rising from the ocean floor.

However, the island reemerged on January 5 and on January 19 a strong eruption with black clouds of volcanic smoke, ash, lava flows and an acidic rain began, continuing for several weeks.

On March 8, residents of neighboring Iōjima made the first landing on the new island.

At that time, the size of Shōwa Iōjima was estimated to be 0.18 square kilometres (0.069 sq mi).