[1] The Nanatsu Kofun cluster is located along Japan National Route 57 on a plateau in western part of Taketa City.

[2] Kofun A, located furthest west, is a round enpun (円墳)-style tumulus with a diameter of 20 meters and a height of four meters.The excavated boat-shaped sarcophagus is 80 cm long and 25 cm wide and has small stone pillows, so it is thought that the tomb was for infant who had just been born.

Grave goods found in Kofun B and C included six bronze mirrors, magatama beads, jasper stone pieces, and dear antler-shaped swords.

The jasper pieces were found to be parts of a stone chime, possibly a bianqing, which had been purposely crushed and its fragments scattered near the remains.

It is located approximately 20 minutes by car from Bungo-Taketa Station on the JR Kyushu Hōhi Main Line.