Tokyo consists of the southwestern part of the Kanto region, the Izu Islands, and the Ogasawara Islands. When the Shogun Tokugawa Ieyasu established a government there in the early 17th century, the area started to develop, spreading out around his residence, Edo Castle. Tokyo was able to achieve a remarkably rapid recovery both times. Tokyo is not only the political and economical center of Japan, it has also emerged as a center of the world economy and culture.