日岡陵古墳, Keyhole-shaped tomb in Kakogawa, Japan
The Hioka Tumulus measures 80 meters in length with a circular rear portion reaching 7.5 meters in height and a rectangular front section 33 meters wide.
Built in the 4th century, the Hioka Tumulus is believed to contain the remains of Empress Harima Inahi Tairō Himemiko, consort of Emperor Keikō.
The burial mound features stone arrangements and fragments of earthenware vessels and Haniwa clay figures, reflecting burial practices of ancient Japan.
The Imperial Household Agency maintains detailed records of the tomb through surveys, including measurements conducted in 1928 and 2011.
Located on Mount Hioka at the northern edge of the Innami Plateau, this tomb initially appeared to be circular but research confirmed its keyhole shape.
Location: 加古川市
Architectural style: keyhole-shaped kofun
GPS coordinates: 34.77995,134.86219
Latest update: November 8, 2025 06:08
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