The Jomon Ruins Facility Muumonkan (Sotohama-cho, Higashitsugaru-gun, TEL 0174-22-2577 ), which exhibits Jomon historical materials, opened on April 26th near the Ohira-Yamamoto ruins.

The Ohirayamamoto site is one of the 17 Jomon sites in Hokkaido and northern Tohoku that were registered as a World Heritage Site in 2021. According to academic surveys by Aomori Prefecture and others, the Ohirayamamoto site is the oldest known site, dating back to around 13,000 BC. It is located near the Kanita River, where siliceous shale, the material used to make stone tools, can be extracted, and pottery has also been excavated along with stone tools.

The facility introduces life from the Paleolithic to Jomon periods through panels and videos, and displays soil layers from the Ohirayamamoto ruins excavation site, pottery fragments designated as prefectural treasures, stone arrowheads, and more. In addition, the hands-on learning room will offer workshops for making mini pottery, braided string, and magatama. The museum shop will sell materials used in the experiences, as well as Jomon goods.

Narita Jun, curator of the Social Education Division of the Sotogahama Town Board of Education, said of the highlights of the museum, "As this is an archaeological site that dates back to the Paleolithic period, there are a large number of stone tools on display. There are also pottery fragments of undecorated pottery, which is said to be the oldest in Northeast Asia. The exhibits show the transition from the Paleolithic period to the Jomon period."

Opening hours are 9:00-16:00. Closed on Mondays (or the following day if Monday is a public holiday). Admission fee is 300 yen for adults, free for university students and younger.