Chūgoku region contains the administrative territorial entity Yamaguchi Prefecture
The Chūgoku region (Japanese: 中国地方, Hepburn: Chūgoku-chihō, IPA: [tɕɯːɡokɯ̥ tɕiꜜhoː]), also known as the San'in-San'yō (山陰山陽地方, San'in-San'yō-chihō) region, is the westernmost region of Honshū, the largest island of Japan. It consists of the prefectures of Hiroshima, Okayama, Shimane, Tottori and Yamaguchi. In 2010, it had a population of 7,563,428.Geography
The Chūgoku region consists of the following prefectures: Hiroshima, Yamaguchi, Shimane, and Tottori. Okayama is also included, although only Bitchū Province was considered a Middle Country; Mimasaka Province and Bizen Province, the other two components of modern-day Okayama, were considered Near Countries. Kyūshū, Shikoku, and Kansai neighbor the Chūgoku region.
The Chūgoku region is characterized by irregular rolling hills and limited plain areas and is divided into two distinct parts by mountains running east and west through its center.
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