Ōshima Subprefecture (Tokyo) in the context of "To-shima"

Nii-jima (新島) is a volcanic Japanese island administered by the Tokyo Metropolitan Government. It is one of the Izu Seven Islands, group of the seven northern islands of the Izu archipelago, and is located approximately 163 kilometres (101 mi) south of Tōkyō and 36 kilometres (22 mi) south of Shimoda Shizuoka Prefecture. The island is the larger inhabited component of the village of Niijima Village, Ōshima Subprefecture of Tokyo Metropolis, which also contains the neighboring island of Shikine-jima and the smaller, uninhabited Jinai-tō. Nii-jima is also within the boundaries of the Fuji-Hakone-Izu National Park.

On the southern tip of Nii-jima, there was formerly a launch site for experimental and sounding rockets.

Kōzu-shima (神津島) is a volcanic Japanese island in the Philippine Sea. The island is administered by Tōkyō and is located approximately 30 kilometres (19 mi) northwest of the Miyake-jima and 14 kilometres (8.7 mi) southwest of the Nii-jima. It is one of the Izu Seven Islands, a group of the seven northern islands of the Izu archipelago.Kōzushima is administratively part of Kōzushima Village (founded 1923), under Ōshima Subprefecture of Tokyo Metropolis. As of 2017, the island's population was 1,952. Kōzushima is within the boundaries of the Fuji-Hakone-Izu National Park.