The Ikemori-Ikegami site located across the boundary between Kumagaya and Gyoda cities, Saitama Prefecture, dates back to the early mid-Yayoi period, with houses built in quadrilateral or rectangular layouts with rounded corners.
埼玉県熊谷市と行田市にまたがる池守・池上遺跡は、弥生時代中期初頭の遺跡で、住居の平面形状は隅丸方形か隅丸長方形である。