A premier Harima keyhole mound preserved in Tamaoka Historic Park, Kasai City. Identified with the tomb the Harima Fudoki says was raised for Princess Nehime, loved by two princes — a rare place where the world of the 8th-century gazetteer can be felt on the ground.
Finds & research
Stones of a chest-style sarcophagus in situ; cylindrical, house, and rooster haniwa; blades, curved and tubular beads.
Two views on the occupant
Archaeological view
A keyhole mound ~109m long (rear circle ~64m, front ~54m) surrounded by a moat ~20m wide — among the largest in Harima. Built in the 5th century. Stones of a tuff chest-style sarcophagus remain at the center of the rear circle. Finds include cylindrical, house, and rooster haniwa, blades, and beads.
Imperial Household Agency view
Not designated by the IHA. Protected as the National Historic Site "Tamaoka Kofun Group" (1943; expanded 1978), managed by Kasai City.
Field notes
About 30 min on foot from Hojomachi Station (Hojo Railway). The 6.2-hectare Tamaoka Historic Park preserves six mounds plus one relocated mound, free to visit.