Tadeiyama Kofun

Tadeiyama Kofun is an imperial tomb in Sakai with a distinctive keyhole shape measuring roughly 148 meters in length. The structure features a double moat system surrounding the central mound, demonstrating the technical complexity of this ancient burial facility.

The tomb was built in the 5th century and shows the development of imperial burial architecture during that period. This construction method shaped Japanese burial traditions and influenced the design of similar sites for generations to come.

The name derives from local geographical features of the surrounding landscape. Today visitors can explore the monument's form from outside and observe the carefully maintained ditches that reveal the scale of this ancient burial site.

The site is easily accessible from outside and visitors can view the monument's form from the pathways and vantage points around the grounds. Comfortable shoes are helpful since you can walk around the structure to take in its full shape and scale.

The tomb complex contains two additional burial mounds within its boundaries, a rare arrangement in imperial-era burial architecture. This unusual feature makes it a valuable example of the variety and complexity found in burial practices of that time.

Location: Sakai-ku

Inception: 5 century

Architectural style: keyhole-shaped kofun

Part of: Mozu Tombs

Website: https://kunaicho.go.jp/ryobo/guide/018

GPS coordinates: 34.57610,135.48830

Latest update: December 8, 2025 19:49