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Denshima is located roughly equidistant between Iōjima and Kuroshima. The island is an exposed and highly eroded portion of lava dome associated with the submarine Kikai Caldera, a stratovolcano rising from the ocean floor. It consists of three large rocks, separated by very narrow channels, with a maximum height of 58 metres (190 ft) above sea level, and a smaller rock, just breaching the ocean surface, to one side.
Aerial view of the island. (1978)
