The Shinyama-kofun Tumulus: Otsuka, Koryo Town; the early Kofun period; a square-front, square-back mound; 137 meters; and 34 bronze mirrors were excavated.
新山古墳（しんやま）（広陵町大塚、前期、前方後方墳、137メートル）-34面の銅鏡が出土、