Isohama Kofun Cluster

The Isohama Kofun Cluster contains seven distinct burial mounds, including two keyhole-shaped structures and two circular formations spread across the coastal landscape.

Archaeological excavations between 1949 and 2021 revealed over 4100 grave goods, including bronze mirrors, iron swords, and jade magatama from the mid-3rd century.

The burial structures at Isohama reflect the social hierarchy of ancient Japanese society through their size and construction, with the largest mound reaching 101.4 meters.

The site received National Historic Site designation in 2020 and maintains informative signage that guides visitors through the archaeological discoveries and structural features.

Three additional tumuli at this coastal location remain under consideration for protection status, while recovered artifacts indicate possible maritime connections with western Japan.

Location: Ibaraki Prefecture

Location: Oarai

GPS coordinates: 36.31600,140.57036

Latest update: March 10, 2025 15:49