Onigajō extends for about 1 kilometer along the coast and, thanks to the interwoven action of both earthquakes and marine erosion over centuries, this coastline has an otherworldly, peculiar atmosphere to it.
The whole area was historically governed by a warrior family called Arima, and it was here that Arima Tadachika built a castle upon the 153 meter tall summit that was formerly called Oni no iwaya (鬼岩屋). This is the origin of the current name of this structure – Onigajō (“Ogre Castle”).
Oni no iwaya was the largest mountain castle in this region. A legend says that it was a hideout for pirates and that ultimately it was the place where one of the Emperors during the Heian period is said to have dispatched his armies in order to exterminate all the pirates in Japan.


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