Furthermore, it is said to have been a huge square tumulus with 51 meters square stylobate surrounded by a dry moat with stuck stones and additionally with an outer bank (approximately 83 meters from north to south and 81 meters from east to west).
また、一辺51mの方形基壇の周囲に貼石された空濠をめぐらし、さらに外提（南北約83m、東西81m）をめぐらした壮大な方形墳であるという。