It is one of the largest rectangular tombs in the prefecture, measuring 28.2m on a side and 5.6m in height, with a double moat surrounding it, dating from the late Kofun period. The horizontal cave-style stone chamber made of chlorite schist, a specialty of Ogawa, still remains beautifully. Prefecturally designated historic site.
〒355-0332 埼玉県比企郡小川町増尾63−1