List of regions of Japan
Japan is divided into eight regions. They are not official administrative units, though they have been used by government officials for statistical and other purposes since 1905. They are widely used in, for example, maps, geography textbooks, and weather reports, and many businesses and institutions use their home regions in their names, for example Kinki Nippon Railway, Chūgoku Bank, and Tōhoku University.
Each region contains one or more of the country's 47 prefectures. Of the four main islands of Japan, Hokkaidō, Shikoku, and Kyūshū make up one region each, the latter also containing the Ryukyu Islands, while the largest island Honshū is divided into five regions. Okinawa Prefecture is usually included in Kyūshū, but is sometimes treated as its own ninth region.
Japan has eight High Courts, but their jurisdictions do not correspond to the eight regions (see Judicial system of Japan for details).