Tokyo Metropolis (prefecture); Tokyo metropolitan area
Refers to the administrative prefecture of Tokyo, which includes the 23 special wards, the Tama area, and the outlying islands. Often used in official contexts and addresses.
東京都は日本の首都です。
Tokyo Metropolis is the capital of Japan.
東京都内の交通はとても便利です。
Transportation within the Tokyo metropolitan area is very convenient.
Compound of 東京 (Tokyo) + 都 (metropolis). The term was established in 1943 when Tokyo City and Tokyo Prefecture merged into the current Tokyo Metropolis.