Tokyo (-|--, T--ky--) is Japan's capital and the world's most populous metropolis. It is also one of Japan's 47 prefectures, consisting of 23 central city wards and multiple cities, towns and villages west of the city center. The Izu and Ogasawara Islands are also part of Tokyo. Prior to 1868, Tokyo was known as Edo.Jan 18, 2018read more >>