The regions of Japan are not official administrative units, but have been traditionally used as the regional division of Japan in a number of contexts. For instance, maps and geography textbooks divide Japan into the eight regions, weather reports usually give the weather by region, and many businesses and institutions use their home region as part of their name (Kinki Nippon Railway, Chūgoku Bank, Tohoku University, etc.).
http://en.wikipedia.org/wiki/Regions_of_Japan
関東地方.jp Kantō Region
The Kantō region (関東地方 Kantō-chihō) is a geographical area of Honshū, the largest island in Japan. The region encompasses seven prefectures within the Greater Tokyo Area: Gunma, Tochigi, Ibaraki, Saitama, Tokyo, Chiba, and Kanagawa.
*部地方.jp Chūbu Region
Chūbu (*部地方 Chūbu-chihō) is the central region of Honshū, Japan's main island.
The Chūbu, or central region, encompasses nine prefectures in the midland of Japan, west of the Kantō region: Aichi, Fukui, Gifu, Ishikawa, Nagano, Niigata, Shizuoka, Toyama, and Yamanashi.
関西地方.jp Kansai Region
近畿地方.jp Kinki Region
The Kansai region (関西地方 Kansai-chihō) of Japan, also known as the Kinki region (近畿地方 Kinki-chihō?), lies in the Southern-Central region of Japan's main island, Honshū.
*国地方.jp Chūgoku Region
The Chūgoku region (*国地方 Chūgoku-chihō) is the westernmost region of Honshū, the largest island of Japan. The name literally means "middle country", a relic of a historical division of Japan into "near countries" (近国 Kingoku, but in modern parlance Kinki), "middle countries" and "far countries" (*国 Ongoku), based on distance from the capital Nara or Kyoto. In Japanese, the characters *国 and the reading Chūgoku are also used to mean "China" (more precisely, the People's Republic of China since the Republic of China is commonly referred to as "Taiwan" in Japanese). The same characters are used in Chinese to refer to China, but pronounced Zhōngguó lit.
四国地方.jp Shikoku Region
Shikoku (四国 "four provinces") is the smallest and least populous (4,141,955 as of 2005) of the four main islands of Japan. Its ancient names include Iyo-no-futana-shima (伊予之二名島), Iyo-shima (伊予島), and Futana-shima (二名島). The current name refers to the four old provinces which made up the island: Awa, Iyo, Sanuki, and Tosa.
九州地方.jp Kyūshū Region
Kyūshū (九州 Kyūshū), literally "Nine Provinces," is the third largest island of Japan and most southerly and westerly of the four main islands. It is considered the birthplace of the Japanese civilization whereof the warm climate and high forestry and agricultural production.
東北地方.jp Tōhoku Region
The Tōhoku region (東北地方 Tōhoku-chihō) is a geographical area of Japan. Tōhoku is Japanese for "northeast," and the Tōhoku region occupies the northeastern portion of Honshū, the largest island of Japan.
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