Izu Peninsula in the context of "Nanpō Islands"

The Islands of Tokyo (東京諸島, Tokyo-shotō), also known as the Insular Area of Tokyo Metropolis (東京都島嶼部, Tōkyō-to-tōshobu) or Izu-Ogasawara islands (伊豆・小笠原諸島, Izu-Ogasawara-shotō), consist of the Izu and Ogasawara (also known as Bonin) island chains to the south of the Izu Peninsula.

The Izu Islands (伊豆諸島, Izu Shotō; Japanese pronunciation: [i.(d)zɯ, i.(d)zɯ ɕoꜜ.toː]) are a group of volcanic islands stretching south and east from the Izu Peninsula of Honshū, Japan. Administratively, they form two towns and six villages; all part of Tokyo Prefecture. The largest is Izu Ōshima, usually called simply Ōshima.

Although usually called the "Seven Islands of Izu" (伊豆七島 in Japanese), there are in fact more than a dozen islands and islets. Nine among them are currently inhabited.

The Toi gold mine (土肥鉱山, also 土肥金山, Toi kinzan) was an important gold mine during the Edo period in Japan, located within what is now part of the city of Izu, Shizuoka Prefecture in the middle of the Izu Peninsula. It remained in operation to the mid-twentieth century.

Shizuoka Prefecture (静岡県, Shizuoka-ken; Japanese pronunciation: [ɕi.(d)zɯꜜ.o.ka, ɕi.(d)zɯ.o.kaꜜ.keɴ]) is a prefecture of Japan located in the Chūbu region of Honshu. As of September 2023, Shizuoka Prefecture has a population of 3,555,818 and has a geographic area of 7,777.42 km (3,002.88 sq mi). Shizuoka Prefecture borders Kanagawa Prefecture to the east, Yamanashi Prefecture to the northeast, Nagano Prefecture to the north, and Aichi Prefecture to the west.

Shizuoka is the capital and Hamamatsu is the largest city in Shizuoka Prefecture, with other major cities including Fuji, Numazu, and Iwata. Shizuoka Prefecture is located on Japan's Pacific Ocean coast and features Suruga Bay formed by the Izu Peninsula, and Lake Hamana which is considered to be one of Japan's largest lakes. Mount Fuji, the tallest volcano in Japan and cultural icon of the country, is partially located in Shizuoka Prefecture on the border with Yamanashi Prefecture. Shizuoka Prefecture has a significant motoring heritage as the founding location of Honda, Suzuki, and Yamaha, and is home to the Fuji International Speedway.

Sagami Bay (相模湾, Sagami-wan; also known as the Sagami Gulf or Sagami Sea) lies south of Kanagawa Prefecture in Honshu, central Japan, contained within the scope of the Miura Peninsula, in Kanagawa, to the east, the Izu Peninsula, in Shizuoka Prefecture, to the west, and the Shōnan coastline to the north, while the island of Izu Ōshima marks the southern extent of the bay. It lies approximately 40 kilometres (25 mi) southwest of the capital, Tokyo. Cities on the bay include Odawara, Chigasaki, Fujisawa, Hiratsuka, Itō, and Kamakura.

Izu Ōshima (伊豆大島, Izu-ōshima) is an inhabited volcanic island in the Izu archipelago and borders Sagami Bay and the Pacific Ocean, off the coast of Honshu, Japan, 22 km (14 mi) east of the Izu Peninsula and 36 km (22 mi) southwest of Bōsō Peninsula. As with the other islands in the Izu Island group, Izu Ōshima forms part of the Fuji-Hakone-Izu National Park. Izu Ōshima, at 91.06 km (35.16 sq mi) is the largest and closest of Tokyo's outlying islands, which also include the Ogasawara Islands.

Izu Province (伊豆国, Izu no Kuni; Japanese pronunciation: [i.(d)zɯ (no kɯ.ɲi)]) was a province of Japan in the area now part of Shizuoka Prefecture and Tokyo. Izu bordered on Sagami and Suruga Provinces. Its abbreviated form name was Zushū (豆州).

The mainland portion of Izu Province, comprising the Izu Peninsula, is today the eastern portion of Shizuoka Prefecture and the Izu Islands are now part of Tokyo.