Itsukahara Kofun
Japan
Itsukahara Kofun is a Kofun period keyhole-shaped burial mound, located in the Shibayama, Terato-chō neighborhood of Mukō, Kyoto in the Kansai region of Japan. The tumulus was designated a National Historic Site of Japan and as part of the Otokuni Kofun Cluster in 2016. It is one of the oldest large keyhole-shaped tombs, estimated to have been built in the mid-to-late 3rd century, at the very beginning of the Kofun period.
Archaeological site data from Wikidata (CC0). Summary from Wikipedia (CC BY-SA).