Stone circles and pit dwellings

Massive labor is needed to build on a scale as large as the Ōyu Stone Circles, but only seven pit dwellings have been found at the site. It is also unlikely that many more will be found in future surveys.  This suggests that the Nonakadō and Manza stone circles were built by people from a few (or a dozen) villages some distance away. It is possible that the pit dwellings in the vast green areas to the north of the Manza stone circle were for people who were responsible for organizing festivals, or those who protected the circles.