Tokyo is the capital of Japan. At over 12 million people in the official metropolitan area alone, Tokyo is the core of the most populated urban area in the world, Greater Tokyo Located geographically at about the center of the Japanese archipelago and in the southern part of the Kanto area, Tokyo shares borders with Chiba prefecture to the east along the Edogawa River, Yamanashi to the west along a mountain range, Kanagawa in the south along the Tamagawa River, and Saitama in the north. Being 2187 km² in area, the metropolis occupies only 0.6% of the national land, the third smallest of the 47 administrative divisions of the country. As the land unfolds from east to west, there are hills, plateaus, and mountains scattered around the city. Small as it is, Tokyo's geographical features are rich in variety, comprising low lands of only four meters above the sea-level and mountainous areas of over 2000 meters. In addition, it must be noted that certain volcanic islands in the Pacific such as the Izu and Ogasawara Islands also are part of Tokyo. http://wikitravel.org/en/Tokyo