Large tumuli, from 200 meters to 300 meters, were lined up, and it is said that the Imperial mausoleums of the 10th Emperor Sujin (Andonyama-kofun Tumulus) and the 12th Emperor Keiko (Shibutani Mukoyama-kofun Tumulus) were among them.
200から300メートルの大きな古墳が並び、そのうちには第10代の崇神天皇（行灯山古墳）、第12代の景行天皇（渋谷向山古墳）の天皇陵があるとされている。