Tokyo is also one of Japan’s 47 prefectures, but is called a metropolis (to) rather than a prefecture (ken). The metropolis of Tokyo consists of 23 city wards (ku), 26 cities, 5 towns and 8 villages, including the Izu and Ogasawara Islands, several small Pacific Islands in the south of Japan’s main island Honshu.


The 23 city wards (ku) are the center of Tokyo and make up about one third of the metropolis’ area, while housing roughly eight of Tokyo’s approximately twelve million residents.



The mainland portion of Tokyo lies northwest of Tokyo Bay and measures about 90 km east to west and 25 km north to south. Chiba Prefecture borders it to the east, Yamanashi to the west, Kanagawa to the south, and Saitama to the north. Mainland Tokyo is further subdivided into the special wards (occupying the eastern half) and the Tama area.