A giant keyhole-shaped kofun thought to have had a double moat.
This mound is 230 meters long and is thought to have had a double moat when it was first constructed. It is the fourth largest giant keyhole-shaped kofun (mounded tomb) of the Furuichi Kofun Group and the nineteenth largest in Japan. During the early Meiji era (1868–1912), it was determined to be the mausoleum of Emperor Ingyo, the 19th legendary emperor of Japan. It is also known as the Ichinoyama Kofun. Many artifacts dating from the mid-5th century have been excavated here, including cylindrical haniwa (clay figures); haniwa in the shape of dogs, horses, and human figures; and Sue ware bowls with lids.