An imperial mausoleum at Ishikawa, Kashihara, Nara, managed by the Imperial Household Agency as the tomb of Emperor Kogen, the 8th emperor. Nara Prefecture explains that the mausoleum combines three to nine mounds of the Nakayamazuka group with a natural hill.
Official status & archaeological view
Official status
Managed by the IHA as the mausoleum of Emperor Kogen, the 8th emperor; the official form is keyhole-shaped.
Attribution (jitei): the Imperial Household Agency's determination of whose tomb it manages — separate from heritage designation.
Archaeological view
The IHA visitor page does not give its archaeological size, construction date, or burial structure.
Field notes
Per the IHA, it is about a 16-minute walk from Kintetsu Kashiharajingu-mae Station, and worship is generally possible year-round from 8:30 to 17:00. The goryoin (mausoleum seal) is kept at the Unebi Mausolea Office in Kashihara, Nara, where visitors can use it free of charge (reception 8:30–17:00; staff may be unavailable on weekends, holidays, 29 Dec–3 Jan and some other days). Nearby imperial mausolea: Umeyama Kofun (Mausoleum of Emperor Kinmei)↗ and Noguchi-no-o-no-haka Kofun (Mausoleum of Emperor Tenmu and Empress Jito)↗.