Ainuta Fort


AinutRui (1).JPG


The mound of Ainuta is a mysterious segment of piled earth. Its origins are unknown but it is widely held to be the remnant of a fort, Ainuta-rui. A contending theory is that it was a flood embankment (the Shio River is nearby), but I find this strange as the surviving segment leads away from the river, rather than parallel. It we are viewing a cross-section of the embankment instead, then it was fairly wide and flat for a flood defence.

Visit Notes

Ainuta-rui is a fortified residence site in Fujii Township, Nirasaki Municipality. The ruins of Ainuta-rui consists of a segment of dorui (earthen ramparts) which are thought to have once ensconced a medieval residence, though who built it is unknown. The site is now fields and the embankment, which is quite wide and sloping, hosts an orchard and a bamboo patch.

  • Dorui

Castle Profile
English Name Ainuta Fort
Japanese Name 相垈塁
Founder Unknown
Year Founded Unknown
Castle Type Fortified Manor
Castle Condition Ruins only
Historical Period Pre Edo Period
Artifacts Dorui
Visitor Information
Access Nirasaki Station on the Chūō Main Line; 18 minute walk
Visitor Information 24/7 free; fields
Time Required 10 minutes
Location Nirasaki, Yamanashi Prefecture
Coordinates 35° 43' 17.15" N, 138° 27' 5.94" E
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Added to Jcastle 2022
Contributor ART
Admin Year Visited Viewer Contributed
Friends of JCastle
Oshiro Tabi Nikki
Jōkaku Hōrōki

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