In the Kariyado community on the east side of the Shimousazuka tumulus, the former site of a temple (called Kariyadohai-ji Temple) was found, and at the location in an approx. 5 km north of the Shimousazuka tumulus, the former site of Sekiwagu Kanga, a governmental office in the ritsuryo (codes-based) period, exists.
下総塚古墳の東側に位置する借宿集落は寺院跡（借宿廃寺）がみつかっており、北東約2キロメートルには律令時代の役所跡である関和久官衙遺跡がある。