The 3rd largest keyhole-shaped tumulus in Japan which is at IshidugaOka.
It was built in the early 5th century before the mausoleum of Emperor Nintoku.
Also known as, Mozu Mimihara Nanryou, Misanzai Kofun, or Ishidugaoka Kofun and is one of Mozu Mimihara Sanryou.