On the detailed map of the remains produced from the investigation, the expanse of the area is 2 kilometers long in east-west orientation and 1.5 kilometers long in south-north orientation forming an ellipse shape, with an area up to 3,000 square meters spreading around the location of today's JR Makumuku Station as its center.
遺跡地図上では遺跡範囲はJR巻向駅を中心に東西約2キロメートル・南北約1.5キロメートルに及び、その形は楕円形であり、面積は3000m2にまで達する。