is an early Kofun period burial mound and one of the tumuli in the Makimuku Kofun Cluster in the Higashida Ōtsuka neighborhood of the city of Sakurai Nara Prefecture, Japan. Collectively with the other tumuli in the Makimuku Kofun Cluster, it was designated a National Historic Site of Japan in 2006. 
Overview.
The Higashida Ōtsuka Kofun has a distinctive -style scallop-shaped design, with a total length of approximately 120 meters. It is an example of a "Makimuku-type keyhole-shaped tomb" with a ratio of the circular rear section to the front section of 2:1. The posterior circular portion is approximately 68 meters in diameter, with a height of nine meters, and the anterior rectangular section has a length of 50 meters. Currently, the front part extending to the southwest has been largely removed. The tumulus is surrounded by a moat with width of 21 meters and depth of 1.3 meters. No traces of "fukiishi" roofings stones or "haniwa" have been found.
The interior of the tumulus has never been excavated; however, jar burial was found on the outer bank of the moat, which may predate the construction of the "kofun", which is believed to date from the late 3rd century.