An imperial mausoleum at Tamade, Gose, Nara, managed by the Imperial Household Agency as the tomb of Emperor Koan, the 6th emperor. Gose City's tourism guide notes that the mausoleum sits on a low hill overlooking the surrounding plateau.
Official status & archaeological view
Official status
Managed by the IHA as the mausoleum of Emperor Koan, the 6th emperor; the official form is a round tumulus (enkyu).
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 7-minute walk from JR Tamade 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: Mausoleum of Emperor Kosho↗ and Kurumaki-Kenno Kofun (Mausoleum of Empress Saimei)↗.