Satellite tomb "Otsu" of Daisen Kofun: a round mound 62m across and 9.7m high—the largest round mound in the Mozu area. Like Chayama Kofun (56m), it is built into the middle embankment of Daisen Kofun where that bank widens toward the outer moat. Only these two mounds in the entire Mozu-Furuichi complex stand on a bank between moats, a mark of how closely both are tied to Daisen. The mound appears to have been built in two tiers. It is a constituent monument of the Mozu-Furuichi Kofun Group World Heritage Site, inscribed in 2019.
Finds & research
Details of the burial facility and grave goods are unknown.
Official status & archaeological view
Official status
Managed by the IHA as "Satellite Tomb Otsu (No. 2)" of the Nintoku Mausoleum. Designated as the second in the ko-otsu sequence (following Chayama Kofun as "Ko"). Managed as an appendage of the imperial mausoleum; general entry is restricted.
Attribution (jitei): the Imperial Household Agency's determination of whose tomb it manages — separate from heritage designation.
Archaeological view
Dated to the middle of the Middle Kofun period (first half of the 5th century).
Field notes
The official World Heritage site gives about a 5-minute walk west from Mikunigaoka Station (JR Hanwa Line / Nankai Koya Line). The mound is managed by the IHA and cannot be entered; view it from the surrounding streets.