Sone Kyūryō Park, Archaeological urban park in Kofu, Japan.

Sone Kyūryō Park is a prefectural urban park in Kofu, Yamanashi, known as Kai Fudoki no Oka. It contains the Kai Chōshizuka Kofun, the largest keyhole-shaped mound in the prefecture, and the Maruyama Tsuka Kofun, both part of the Higashiyama kofun group and climbable via hiking trails. The park also houses the Yamanashi Prefectural Archaeological Museum, which opened in 1982.

The park grew out of the archaeological zone around the Kai Chōshizuka Kofun, a keyhole-shaped mound that is the largest in Yamanashi Prefecture. The site lies within the Higashiyama kofun cluster of 16 mounds on the Sone hills, occupied from the Palaeolithic onward. The prefectural museum opened in 1982, and the Fudoki no Oka training centre followed in 1989.

The museum inside displays pottery from the Jomon and Yayoi periods, showing how people in this region crafted ceramics long ago. Walking through the galleries, you can see bowls, vessels, and tools that reveal how communities lived and worked centuries before.

The park is free to walk through during the day, while the museum inside requires admission and has set hours. Plan time to explore both the mounds and the museum collections.

Visitors can walk directly over and around the burial mounds rather than just viewing them from afar or through displays. This hands-on connection to the past makes the archaeological experience more direct and personal.