The 5th century Daisen Kofun (burial mound), the largest of all the keyhole-shaped kofun, in Sakai, Osaka Prefecture, Japan.
David DeMar, writing in the NewHistorian, reports on the discovery of a wooden causeway linking one of Japan’s keyhole-shaped burial mounds to its surrounding land –
Research into an ancient Japanese burial mound has revealed evidence of a wooden bridge being used at the time of the occupant’s burial, before being taken down.
Located in the city of Sakai, south of Osaka, the keyhole-shaped burial mound could have been used as the final resting place of an important individual, either from the imperial family or an emperor himself from the Kofun period (late third to seventh centuries CE). Known as the Nisanzai Kofun, the mound has been dated to the late fifth century CE and would have been surrounded by a large moat, necessitating the construction of a bridge to reach it.
According to an interview in the Asahi Shimbun with Taichiro Shiraishi, Osaka Prefecture’s head of the Chikatsu Asuka Museum, the likelihood seems high that, during the burial, people would have stood on both sides of the bridge as the body, encased in a temporary casket, was laid to rest. Shiraishi pointed to the evidence, consisting of five newly-discovered bore holes that would have been ideal for the piers of a bridge; these holes, which were discovered during excavation efforts in the autumn of 2015, are in addition to the 26 bore holes ringing the burial mound discovered in a 2013 dig. An additional four holes were found progressing across the moat in 2013 as well.