There are two stone circles, Nonakado and Manza. It was created in Jomon period. This site is about 4,000 years ago. These stone circles are formed with over 100 stone circles. It was used as the clock and graves.
Nonakado Stone Circle is about 44m diameter, and Manza Stone Circle is the about 52m diameter. There are many earthenwares and stonewares found on this site.