A roughly 50m keyhole mound in Yasu's Sakurabasama Historic Park, part of the National Historic Site Oiwayama Kofun Group. A small horizontal stone chamber was found in its front, and Korean-style pottery and other finds came from its rear mound.
Finds & research
A right-sleeved horizontal stone chamber in the front, 4.3m long per the Yasu City annual report (the survey and maintenance report gives 4.18m at the exposed level), yielded no artifacts. Haji ware, Sue ware, stoneware, and Korean-style pottery came from the rear mound.
Official status & archaeological view
Official status
Part of the National Historic Site "Oiwayama Kofun Group" (added 1985).
Archaeological view
The Yasu City Board of Education's annual excavation report says no burial facility was confirmed in the rear, while a 4.3m right-sleeved horizontal stone chamber was found in the front. The report dates construction to around the end of the 5th to the beginning of the 6th century.
Field notes
In Sakurabasama Historic Park (9:00–17:00, last admission 16:30, closed Mondays and some other days, free), together with Kabutoyama↗ and other mounds of the Oiwayama group.