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Tokyo (東京, Tōkyō^?, "Eastern Capital") [toːkjoː], English: /ˈtoʊki.oʊ/; officially Tokyo Metropolis (東京都, Tōkyō-to^?), is one of the 47 prefectures of Japan. Tokyo is the capital of Japan, the center of the Greater Tokyo Area, and the largest metropolitan area of Japan. It is the seat of the Japanese government and the Imperial Palace, and the home of the Japanese Imperial Family. Tokyo is in the Kantō region on the southeastern side of the main island Honshu and includes the Izu Islands and Ogasawara Islands. 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 Metro (東京メトロ, Tōkyō Metoro^?) is one of two rapid transit systems making up the Tokyo subway system, the other being Toei. It is the most used subway system in the world in terms of annual passenger rides.