| 1．Ōmeguri-Komeguri Mountain Castle |
| Ōmeguri-Komeguri Mountain Castle (大廻小廻山城, Ōmeguri-Komeguri yamajirō) was an ancient castle (also known as a Korean-style fortresses in Japan (朝鮮式山城, Chōsen-shiki yamajiro) located in what is now the Kusakabe neighborhood of Higashi-ku of the city of Okayama, Okayama Prefecture, in the San'yō region of Japan. Its ruins have been protected as a National Historic Site since 2005.[1] |
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| 2．Okayama Castle |
| Okayama Castle (岡山城, Okayama-jō) is a Japanese castle in the city of Okayama in Okayama Prefecture in Japan. The main tower was completed in 1597,[1] destroyed in 1945 and replicated in concrete in 1966. Two of the watch towers survived the bombing of 1945 and are now listed by the national Agency for Cultural Affairs as Important Cultural Properties. |
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| 3．Kameyama Castle (Okayama) |
| Kameyama Castle (沼城, Kameyama-jō), also well known as Numa Castle, is the remains of a castle structure in Higashi-ku, Okayama Prefecture, Japan. Its ruins have been protected as an Okayama City Designated Historic Site.[1] The castle was bulit by Nakayama Nobutada in the Tenbun period (1532–1555).[2] In 1559, Ukita Naoie killed Nakayama Nobumasa by order of Uragami Munekage.[3] Then Naoie moved Ukita clan's main bastion from Shinjōyama castle.[4] Naoie expanded his territory based in the castle.[3][5] In 1570, Naoie started remodeling Okayama castle and moved from the castle in 1573.[3][6][1] |
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| 4．Takamatsu Castle (Bitchū) |
| Takamatsu Castle (高松城, Takamatsu-jō) of Bitchū Province was a Sengoku period Japanese castle located in what is today the Kayo neighborhood of Kita-ku, Okayama in Okayama Prefecture.[1] The style of the castle was a hirajō (flatland castle) with no stone walls, but only earthen walls. The castle was surrounded by marshes, which formed a natural moat. Its ruins have been protected by the central government as a National Historic Site since 1902.[2] |
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