An emergence-period mound on the Gongenyama ridge above the Ibo River, Tatsuno. Five triangular-rimmed mirrors and a Kibi-style stand share one grave — the dawn of the kofun age in miniature. The chamber is reburied; view the mound from the trail.
Finds & research
Pit-style chamber; five triangular-rimmed mirrors (incl. a mold-mate of Tsubai-Otsukayama), coffin, wooden pillow, iron tools, special stand haniwa.
Two views on the occupant
Archaeological view
A square-fronted mound 42.7m long of the mid-to-late 3rd century. Its summit chamber yielded five triangular-rimmed mirrors — including one from the same mold as Tsubai-Otsukayama in Kyoto — a split-log coffin, wooden pillow, iron tools, and Harima's only special cylindrical stand haniwa. A textbook site combining early mirror distribution with Kibi-style ritual.
Imperial Household Agency view
Not designated by the IHA nor as a cultural property (no designation could be confirmed).
Field notes
Reachable by hiking trail (chamber closed). The mirrors are periodically displayed in Tatsuno.