a tomb at this location indicates as strong political and cultural connection with the San'in region, possibly the ancient Kingdom of Izumo. 3. The (1,896 square meters) is a late Yayoi to early Kofun period "two conjoined rectangle-shaped tumulus" (zenpō-kōhō-fun (前方後方墳)), located 110 meters northeast of the Rokuji Kozuka Kofun at an elevation of 52 meters. Its design shows a transition phase between the rectangular tombs of the Yayoi period and the true keyhole-shaped tombs of the Kofun period, and is believed to have been built by the same people who settled the Senbōyama Site. The tomb has a 25.2 meter total length with an anterior portion 10.2 meters long and 8.1 meters wide and a posterior portion 15.0 meters long and 16.5 meters wide and 1.7 meters high. There are traces of a moat. In the center, the existence of a burial chamber has been confirmed, but the mound has not been opened. Large quantities of Yayoi pottery have been recovered from the site. It is presumed to be the tomb of the chief of the area, who lived at the Senbōyama site 270 meters northeast. 4. The (8,118 square meters) is a cluster of three late Yayoi period rectangular "corner protruding" tombs (Yosumi tosshutsugata funkyūbo) located on the right bank of the Yamadagawa River on the northern margin of Tomisaki hill at an elevation of about 70 meters. Mound No.1 is 21.7 meters on a side, with a height of 3 meters. Mound No.2 is estimated to be about the same size as Mound No.1, but it is extensively damaged. Both have moats. Mound No.3 is located 150 meters apart across a small valley and is slightly larger at 22 meters per side with a height of 3.9 meters, wth moats only on the sides. In each case, the protrusion has a length of 6 meters. 5. The (27,651 square meters) is a necropolis built in the early Kofun period, of which 17 kofun (one keyhole shaped, one dome-shaped, and 15 rectangular-shaped) have thus far been discovered. It is located in the east margin of the Tomisaki Hills at an elevation of 55 meters. The necropolis is divided into a north group and a south group separated by a valley, but only the southern group is part of the National Historic Site. Mound No.9 is the only two conjoined-rectangle type tumulus in the group and is located at