The burial facility is unexcavated and the occupant unknown. Kochoshi Kofun is considered its 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.
Official status & archaeological view
Official status
It was designated the National Historic Site Choshiyama Kofun Nos. 1 and 2 on 8 March 1922, with an additional area designated in 2011.
Archaeological view
A 201m three-tiered keyhole mound at Amino-cho, Kyotango—the largest on the Sea of Japan coast. Dated by Kyotango City to the late 4th century (the city’s list of designated sites gives the first half of the Middle Kofun period), it has stone facing, Tango-type cylindrical haniwa on each terrace, and a 17–25m-wide ditch on the south.
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.