A terminal-period square mound on the Obitoke hills at Tanakacho, Nara. Its brick-style chamber, like Hanayama-Nishizuka's↗, marks the arrival of continental masonry. Viewable from the oratory.
Finds & research
Brick-laid (sen-zumi) horizontal stone chamber, plastered (12.47m surviving); Sue and Haji ware.
Official status & archaeological view
Official status
Managed by the IHA as the Koganezuka reference site.
Attribution (jitei): the Imperial Household Agency's determination of whose tomb it manages — separate from heritage designation.
Archaeological view
A square mound ~30m per side (~120m east–west including the outer banks), built in the mid-7th century; it now shows two tiers, though the IHA survey report considers it originally three-tiered. Its brick-laid (sen-zumi) plastered horizontal stone chamber of Haibara stone — 12.47m surviving, two-roomed — is a representative example of a rare chamber type of the terminal period. The Nara City Board of Education dated its construction to the mid-7th century from pottery found in its 2009 excavation.
Field notes
Walkable from JR Obitoke Station; the chamber is closed.