関東平野
The Kantō Plain, Osaka Plain and Nōbi Plain are the most important economic, political and cultural areas of Japan. These plains had the largest agricultural production and large bays with ports for fishing and trade. This made them the largest population centers. Kyoto and Nara are the ancient capitals and cultural heart of Japan. The Kantō Plain became Japan's center of power, because it is the largest plain with a central location and historically it had the most agricultural production that could be taxed. The Tokugawa Shogunate established a "bakufu" in Kamakura in 1603. This evolved into the capital of Tokyo by 1868.