Recently some archaeologists advocated that the Mausoleum was the Otsukayama Tumulus (a keyhole-shaped mound; 335m in length) stretching over Nishiotsuka, Matsubara City, Osaka Prefecture and Minami-eganoso, Habikino City.
近年一部の考古学者が、同県松原市西大塚と羽曳野市南恵我之荘に亘る河内大塚山古墳（前方後円墳・全長335m）とする説がある。