Sōja Kofun Cluster
The Sōja Kofun Cluster is a group of Kofun period burial mounds located in what is now the Sōja neighborhood of the city of Maebashi, Gunma Prefecture in the northern Kantō region of Japan. Five of the kofun in this group were collectively designated a National Historic Site of Japan in 2024.
Overview
The Sōja Kofun Cluster is located in the northwestern part of Maebashi city, on the west bank of the Tone River at the southeastern foot of Mount Haruna in central Gunma Prefecture. The burial mounds were constructed in the first half of the 7th century, towards the end of the Kofun period, and are the graves of powerful families who ruled the region from the late 5th century to the late 7th century. The group consists of:| Area | Name | Type | Lenth | Date | HS status |
| N | Tōmiyama Kofun | Zenpokoenfun | 88 meters | late 5c | NHS |
| S | Ōyama Kofun | Zenpokoenfun | 76 meters | early 6c | CHS |
| S | Ōkawaharayama Kofun | Zenpokoenfun | （destroyed） | ||
| N | Sōja Futagoyama Kofun | Zenpokoenfun | 90 meters | late 6c | NHS |
| N | Sōja Atagoyama Kofun ] | Square | 56 meters | mid-7c | NHS |
| N | Hōtōzan Kofun | Square | 66 meters | mid-7c | NHS |
| N | Jaketsuzan Kofun | Square | 44 meters | mid-7c | NHS |