| Location | Nara Pref. |
|---|---|
| Shape | Keyhole-shaped mound |
| Mound length | 220 m |
| Period | Late 4th–early 5th c. |
220m mound in Koryo Town — the largest in the Umagami group. Features triple moats and is the centrepiece of Umagami Hills Park.
Multiple surveys by Hiraka Town Board of Education and the Kashihara Archaeological Research Institute (national historic site 1958). The mound structure including the ritual protrusion (tsukuridashi) has been documented in detail. Finds around the tsukuridashi: ritual wooden implements, haniwa (water-bird-shaped, house-shaped, cylindrical, morning-glory-shaped), and pottery. The triple-moat structure is confirmed. Water-bird haniwa (interpreted as cormorant or swan) illustrate the symbolic role of birds in funerary ritual. Displayed at the Mami Ryokyukan Guidance Center.
Open to the public as Umagami Hills Park. Also famous for seasonal flower displays.