 The larger circle, named the “Manza” circle has a diameter of 46 meters, and is the largest stone circle found in Japan.A number of reconstructions of Jomon period dwellings have been built around the site.The slightly smaller circle, named the “Nonakado” circle, is 42 meters in diameter and is located around 90 meters away, separated from the “Manza” circle by Akita Prefectural Route 66.