A large chiefly tomb in the Iwase-Senzuka group, known for the scale of its 88m mound and the 5.9m-high main room of its horizontal stone chamber, and for a distinctive structure making extensive use of stone shelves and beams.
Finds & research
The rear circular mound has an Iwase-type horizontal stone chamber with eight stone beams and two stone shelves. Finds include Sue ware.
Official status & archaeological view
Official status
Added in 2016 to the Special Historic Site Iwase-Senzuka Kofun Group.
Archaeological view
A two-tiered keyhole mound 88m long on the summit of Tennozukayama at about 155m elevation, one of the largest in Wakayama Prefecture. The Wakayama Prefectural Kii-Fudoki-no-Oka Museum describes it as a chiefly tomb of the mid-6th century. The horizontal stone chamber in its rear circular mound has a main room 5.9m high, regarded as Japan’s second tallest, with eight stone beams and two stone shelves characteristic of the Iwase type.
Field notes
As of 2026, the tomb cannot be visited because of conservation work and a blocked access road after a slope collapse; the Kii-Fudoki-no-Oka notice tentatively extends through the end of fiscal 2026. Its museum is also temporarily closed for rebuilding. Check the official site before visiting.