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A pit-dwelling longer than 10 meters in length is called large pit-dwellings. A number of large pit-dwellings have been found around the center of the settlement. This area shows how a large pit-dwelling built in the Early Jomon period (approximately 5,000 years ago) was excavated. It is an approximately 18-meter long structure. The existence of pillar marks on the outside of the structure suggests that the house may have been rebuilt.
A pit-dwelling longer than 10 meters in length is called large pit-dwelling. This restored model is the largest in Japan; it is approximately 32 meters long and 9.8 meters wide, resulting in a floor area of approximately 250 m2. This site displays a large pit-dwelling built at the end of the Middle Jomon period (approximately 4,000 years ago). It has been theorized that this structure served as a gathering space or as communal workshop.