Tsunozuka_Kofun
Tsunozuka Kofun (角塚古墳) is a keyhole-shaped kofun burial mound located in the Isawa neighborhood of the city of Ōshū, Iwate in the Tōhoku region of northern Japan. It is significant in that it is the northernmost keyhole-shaped kofun yet discovered,[1] and indicates the penetration of Kofun period culture into lands traditionally considered part of the Emishi cultural zone.