The Kai Choshizuka Kofun in Shimosonecho, Kofu City is the largest keyhole-shaped burial mound (zenpokoen-fun) in Kai Province (present-day Yamanashi Prefecture), stretching approximately 169 meters in total length and estimated to have been constructed in the latter half of the 4th century. Located on a hill on the southern side of the Kofu Basin overlooking the Southern Alps, it is the principal…

A keyhole-shaped burial mound approximately 169 meters long, constructed in the latter half of the 4th century. The largest kofun in Kai Province and the principal mound of the Higashi-Yamanashi Kofun Cluster. Excavations yielded haniwa and stone paving. Designated a national historic site; an obser…