| 1．Takayama Castle (Mihara) |
| Takayama Castle (高山城, Takayama-jō) of Aki Province was a yamajiro-style Japanese castle located in what is today the Hongō neighborhood of the city of Mihara in Hiroshima Prefecture. Its ruins have been protected by the central government as a National Historic Site since 1957.[1] |
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| 2．Niitakayama Castle |
| Niitakayama Castle (新高山城, Niitakayama-jō) of Aki Province was a yamajiro-style Japanese castle located in what is today the Hongō neighborhood of the city of Mihara in Hiroshima Prefecture. Its ruins have been protected by the central government as a National Historic Site since 1957.[1] |
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| 3．Mihara Castle |
| Mihara Castle (三原城, Mihara-jō) was a hirajiro-style Japanese castle located in what is today the city of Mihara in Hiroshima Prefecture. Its ruins have been protected by the central government as a National Historic Site since 1957.[1] |
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