Tokyo (東京 Tōkyō, "Eastern Capital") (Japanese: [toːkjoː], English /ˈtoʊki.oʊ/), officially Tokyo Metropolis (東京都 Tōkyō-to), is one of the 47 prefectures of Japan, and is both the capital and largest city of Japan. The Greater Tokyo Area is the most populous metropolitan area in the world. It is the seat of the Emperor of Japan and the Japanese government. Tokyo is in the Kantō region on the southeastern side of the main island Honshu and includes the Izu Islands and Ogasawara Islands. Formerly known as Edo, it has been the de facto seat of government since 1603 when Shogun Tokugawa Ieyasu made the city his headquarters. It officially became the capital after Emperor Meiji moved his seat to the city from the old capital of Kyoto in 1868; at that time Edo was renamed Tokyo. Tokyo Metropolis was formed in 1943 from the merger of the former Tokyo Prefecture (東京府 Tōkyō-fu) and the city of Tokyo (東京市 Tōkyō-shi).
- Tokyo is the capital city of Japan.
- In 1943, the city of Tokyo merged with the "Metropolitan Prefecture" of Tokyo. Since then, the Tokyo metropolitan government served as both the prefectural government for Tokyo, as well as administering the Special wards of Tokyo, for what had previously been Tokyo City.
- Tokyo was originally a small fishing village named Edo, in what was formerly part of the old Musashi Province.