Tokyo, officially known as the Tokyo Metropolis, serves as the capital and most populous city of Japan. It is located within the Tokyo region and functions as a primary urban center for the country.
As of 2023, the population of the city proper exceeded 14 million residents. The surrounding Greater Tokyo Area, which encompasses parts of six neighboring prefectures, is the third-most populous metropolitan area globally, with an estimated 33 million residents as of 2025.