Ohshio Castle (Azumi)

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AzumiOhshiojou (6).jpg


Local legend holds that Ôshiojō was first built by Minamoto Yoshishige (son of Kiso Yoshinaka) during his war with Abe Sadakatsu in the early Kamakura period, but the ruins we see today date to much later. In the Sengoku period Ôshiojō was likely (re-)built by the Nishina Clan as part of a chain of forts protecting this mountainous hinterland of the territory from the likes of the Murakami Clan to the east. It is also speculated that Yamagata Masakage built the fort for use during his attack on Senmijō to the north.

Visit Notes

Ôshiojō is a yamajiro (mountaintop castle) ruin in the Ôshio neighbourhood of Miasa Township, Ômachi Municipality. Ôshiojō has a compact but satisfying layout. It is a single bailey complex made up of a central bailey, terraced in the middle, surrounded by concentric sub-baileys and terracing, including an obikuruwa (belt bailey) which rings the entire hilltop. The ridge which leads to the fort is protected by trenches and embankments. There is also a prominent corner segment of dorui (earthen ramparts) on the portion of the obikuruwa which overlooks the ridge.

  • Main bailey and sign about castle

Castle Profile
English Name Ohshio Castle (Azumi)
Japanese Name 安曇大塩城
Founder Nishina Clan; Yamagata Masakage
Year Founded Early Kamakura Period or Sengoku Period
Castle Type Mountaintop
Castle Condition Ruins only
Historical Period Pre Edo Period
Artifacts Kuruwa, Hori, Dorui, &c.
Features trenches
Visitor Information
Access Shinano-Ômachi Station on the Ôito Line; rental e-bike
Visitor Information 24/7 free; mountain
Time Required 40 minutes
Location Ômachi, Nagano Prefecture
Coordinates 36° 32' 3.37" N, 137° 53' 17.59" E
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Added to Jcastle 2023
Contributor ART
Admin Year Visited Viewer Contributed
Friends of JCastle
Jōkaku Hōrōki

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