The Flag of Koto Tokyo, Japan, is the official symbol representing the city's administrative district. It consists of a white field with a red circle in the center, symbolizing the sun over a plain, which is a traditional Japanese motif often associated with the rising sun. The flag was adopted on April 1, 1947, and it reflects Koto Tokyo's historical and cultural significance as one of Japan's oldest cities. The flag serves as an emblem of unity, progress, and tradition for the city and its residents.