The "unopened chieftain's tomb" atop Mt. Yukino, on the borders of Omihachiman, Higashiomi and Ryuo. Its chamber, sealed for 1,700 years until 1989, is a landmark of Heisei-era archaeology. Hike to the summit; a park with interpretation lies at the foot.
A 70m keyhole mound on the summit of Mt. Yukino (rear circle 40m, two tiers, stone paving), built in the early 4th century. In 1989 its pit-style chamber (6.1m) was found intact, yielding five mirrors (incl. triangular-rimmed), 96 bronze arrowheads, a hoe-shaped stone, and lacquerware — a nationally celebrated discovery of an unlooted early chieftain's tomb.
Imperial Household Agency view
Not designated by the IHA. National Historic Site (2014); the finds were designated Important Cultural Properties in 2001.
Field notes
A 30–40 min hike to the summit (chamber reburied); Yukinoyama Historical Park lies at the base.