The burial facility is unexcavated and the occupant unknown. Ko-Choshiyama is considered a satellite tomb. Historic-site improvements were completed in April 2025, including a guidance facility and parking.
Finds & research
Stone facing and rows of Tango-type cylindrical haniwa are documented. Grave goods remain unknown because the burial facility has not been excavated.
Two views on the occupant
Archaeological view
A 201m three-tiered keyhole mound at Amino, Kyotango—the largest on the Sea of Japan coast. Built in the late 4th century, it has stone facing, Tango-type cylindrical haniwa on each terrace, and a 17–25m-wide ditch on the south.
Imperial Household Agency view
This is not an IHA mausoleum. It was designated the National Historic Site Choshiyama Kofun Nos. 1 and 2 on 8 March 1922, with an additional area designated in 2011.
Field notes
The site is currently free and open year-round, with mound stairs and visitor parking. Check Kyotango City for current access and facility information.