Located in the slightly northern part of Sakai City, it is said that there were once more than 100 of them, but now, with Daisen Park in between, there are the Nintoku Tenno-ryo Tumulus (486m long) and the Ricchu-tenno-Ryo Kofun. On the east side are Itasuke Tumulus (146 m long), Gobyoyama Tumulus (203 m long), Nisanzai Tumulus (290 m long), and on the north side is Hanzei Emperor's Mausoleum. A total of 44 ancient tombs remain, including Ryokofun (mound length 148m). Most of them are huge keyhole-shaped tumuli, which are thought to have been built as tombs of great kings between the end of the 4th century, the beginning of the 5th century, and the late 6th century. According to the Nihon Shoki, the name Mozu was given to the people who worked on the construction of Emperor Nintoku's tomb in this area, which was once called Ishizuhara. It is said that the name of the place was changed to ``Mozu'' because a deer jumped into the area and fell to its death, and a Mozu bird jumped out of the deer's ear and tore the inside of the ear out.