The Kakinoshima site is located next to the Hakodate Jomon Culture Center, which is displaying a national treasure. It is a very valuable site with the remains of a long-term settlement – a settlement from about 9,000 to 3,000 years ago. This site was registered as a UNESCO World Heritage Site in July 2021.
The most distinctive feature of this site is the U-shaped earthwork mound, which is one of the largest mounds in Japan with a length of 190 m and a width of 120 m. Pit graves have been found in the mound in addition to earthenware and stone tools. A small hill at the center is like a baseball mound and is considered to have been used as a place for rituals.