Japan has an urban agglomeration along the Pacific coast of Japan with three metropolitan areas as the core. The Japanese government established the Reconstruction Agency in response to the Great East Japan Earthquake. The coagulation time in Reconstruction Agency is 10 years after the earthquake. The "Rehabilitation Bureau" is headquartered in Tokyo and has branches in Morioka, Sendai and Fukushima.

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At present, the "cities designated by decree" are: Sapporo, Sendai, Saitama, Chiba, Kawasaki, Yokohama, Sagamihara, Niigata, Shizuoka, Hamamatsu, Nagoya, Kyoto, Osaka, Horiba, Kobe, Okayama, Hiroshima, Kitakyushu, Fukuoka and Kumamoto.

Among these 20 cities, Yokohama has the largest population of nearly 3.7 million, which is considered as a big city even in China. The population of the least populated areas (Okayama and Sagamihara) exceeds 700,000, and most cities exceed 6,543.8+00,000.

Government decree city is the most decentralized city in Japan's urban autonomy system (that is, the city with the highest level). It can not only set up administrative districts (equivalent to municipal districts in Chinese), but also have more autonomy than ordinary cities, including civil affairs, urban planning, culture, education, agriculture and other public affairs.

Baidu Encyclopedia-Japan