Okayama Prefecture
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Okayama Prefecture is a region located in Japan that serves as an administrative division of the country. It is significant as part of Japan's prefectural system of government and geography.
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Okayama Prefecture (岡山県, Okayama-ken; Japanese pronunciation: [o.kaꜜ.ja.ma, o.ka.ja.maꜜ.keɴ]) is a prefecture of Japan located in the Chūgoku region of Honshu. Okayama Prefecture has a population of 1,815,165 (1 October 2025) and has a geographic area of 7,114 km (2,746 sq mi). Okayama Prefecture borders Tottori Prefecture to the north, Hyōgo Prefecture to the east, and Hiroshima Prefecture to the west.
Okayama is the capital and largest city of Okayama Prefecture, with other major cities including Kurashiki, Tsuyama, and Sōja. Okayama Prefecture's south is located on the Seto Inland Sea coast across from Kagawa Prefecture on the island of Shikoku, which are connected by the Great Seto Bridge, while the north is characterized by the Chūgoku Mountains.