Tokyo, officially the Tokyo Metropolis, is the capital of Japan and the most populous city in the world with a population of over 14 million residents as of 2023. The Tokyo metropolitan area, which includes Tokyo and nearby prefectures, is the world's most-populous metropolitan area with 40.8 million residents as of 2023.Located at the head of Tokyo Bay, Tokyo is part of the Kantō region on the central coast of Honshu, Japan's largest island.