Investigations of external features identified rows of cylindrical haniwa on the inner embankment, morning-glory haniwa, and a causeway crossing the outer moat. The central burial facility and grave goods are unknown.
Two views on the occupant
Archaeological view
An approximately 219m keyhole mound at Saki, Nara. Nara City places its construction after Konabe (early 5th century) and Uwanabe (mid-5th century), suggesting a mid-to-late 5th-century date. Its moat, inner and outer embankments, causeways, and cylindrical and morning-glory haniwa have been identified. The central burial facility is unexcavated.
Imperial Household Agency view
The Imperial Household Agency designates and manages it as Narasaka-no-E Mausoleum of Iwanohime, empress of Emperor Nintoku. The designation follows chronicle tradition; the occupant has not been archaeologically verified.
Field notes
The mound is closed as an Imperial mausoleum. View it from surrounding public roads and authorized worship areas.