The Haginoo Kofun is located at the western end of the Shobara Plateau, which extends to the west of Mount Yakeishi in the southern part of the city of Ōmuta, and is approximately 41 meters above sea level.

To the south, the Suwa River, which forms the prefectural border between Fukuoka and Kumamoto, flows westward, and tuff, which is a pyroclastic flow deposit from Mount Aso, is widely distributed throughout the area, and tuff is also used for the stone materials of this tumulus.

Each chamber was constructed by placing huge cut monoliths of tuff as foundations at the bottom of the walls and stacking split stones at the top, and the ceilings are quite high.

[2] This tumulus is notable for its burial chamber structure, and that it is a decorated kofun with paintings in a single color on the walls.

It is located adjacent to the Ariake National College of Technology, [2] or 4.6 kilometers southeast of Ōmuta Station on the JR Kyushu Kagoshima Main Line.