Tokyo (東京?), formally Tokyo Metropolis Tōkyō (東京都?) is the capital and biggest city of Tōkyō-toJapan. Tokyo is one of the 47 prefectures of Japan, as well as the most popular target for kaiju. Located on the eastern side of the main island Honshū, Tokyo is unique among the prefectures, providing certain municipal services characteristic of a city.
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Tokyo was originally known as "Edo", meaning "estuary." Its name was changed to Tokyo (Tōkyō: tō (east) + kyō (capital)) when it became the de facto imperial capital in 1868.