Searching for the famous amazing huge ocean made pot holes at HIRANEZAKI on SADO ISLAND, Niigata prefecture. Adeytogeological stratumHiranezaki potholesJapanJapan TravelNiigataNiigata destinationsNiigata tourNiigata travelNiigata tripNiigata vacationniigata-prefecturepot holes at HIRANEZAKIsado islandsea vortex potholesshell fosils新潟AloJapan.com
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