The third largest giant keyhole-shaped kofun in the Furuichi Kofun Group.
The Chuai-tenno-ryo Kofun is a giant, 242-meter-long keyhole-shaped kofun (mounded tomb) with a wide moat and narrow embankment. It is thought to have been built between the end of the 5th century and the beginning of the 6th century, based on the haniwa (clay figures) excavated from the embankment and elsewhere. The Hachizuka Kofun, thought to be a satellite mound, is located at the round end of the keyhole-shaped kofun. Mallard ducks migrate to the water-filled moat in the winter.