Prior to 1943, Tokyo was the name of both one of the 47 prefectures of Japan, Tokyo-fu, and the populous city of Tokyo in the eastern half of the prefecture. In 1943 the city and prefecture were merged into a unique prefectural level government entity, known as ''Tōkyō-to'' 東京都 or "Tokyo Metropolis". This administrative region includes the twenty-three "special wards" of the former city, many suburban cities in the western half of the prefecture, and two chains of islands extending south into the [[Pacific Ocean]]. About 12 million people, 10 percent of Japan's population, live within Tōkyō-to's prefectural boundaries. | Prior to 1943, Tokyo was the name of both one of the 47 prefectures of Japan, Tokyo-fu, and the populous city of Tokyo in the eastern half of the prefecture. In 1943 the city and prefecture were merged into a unique prefectural level government entity, known as ''Tōkyō-to'' 東京都 or "Tokyo Metropolis". This administrative region includes the twenty-three "special wards" of the former city, many suburban cities in the western half of the prefecture, and two chains of islands extending south into the [[Pacific Ocean]]. About 12 million people, 10 percent of Japan's population, live within Tōkyō-to's prefectural boundaries. |