The six-pillared structure is built from large chestnut logs, each about one meter in diameter, which were charred at the base to prevent decay.
Excavations revealed large-scale middens (trash heaps) containing vast quantities of food remains, providing a detailed record of the Jomon diet.
DNA analysis of chestnut remains at the site suggests early human intervention in the selection and cultivation of nut-bearing trees.
The settlement layout shows clear residential areas, storage zones, and burial grounds, indicating a highly organized society.
Thousands of pieces of Jomon pottery discovered here exhibit intricate cord-marked patterns characteristic of the period.
The site includes a reconstruction of a massive trench-enclosed graveyard located to the north of the residential area.
Jade ornaments discovered at the site indicate that inhabitants participated in long-distance trade networks, as jade sources are located in western Japan.
Analysis of pollen at the site confirms that the environment 5,000 years ago was significantly warmer than present-day Aomori.
The Sannai-Maruyama site is the largest and best-preserved Jomon period settlement in Japan, dating back 5,500 to 4,000 years. It features reconstructed pit dwellings, raised-floor buildings, and a massive six-pillared structure that stands as a symbol of the site. Excavations revealed that Jomon people here lived in a settled society rather than a nomadic one, sustained by gathered nuts, hunted game, and early forms of plant cultivation. The site is a Special Historical Site designated by the Japanese government. The onsite Jomon Jiyukan museum displays thousands of artifacts recovered from the site, including lacquerware, jade ornaments, and pottery. The reconstructed structures are built using traditional methods and materials to provide an accurate representation of prehistoric living conditions. The site covers approximately 26 hectares, with large sections preserved as they were discovered.
The elevated observation deck overlooking the massive six-pillared reconstruction.
Download the site's official audio guide app before arrival to better understand the reconstructed structures.
Walk the full perimeter of the excavated pits to gain a sense of the settlement's original scale.
Allow ample time for the Jomon Jiyukan museum, as it contains the most significant physical artifacts.
Ignoring the museum portion; many visitors focus only on the outdoor reconstructions and miss the primary archaeological context provided inside.
Closed on the fourth Monday of each month and during the year-end holidays.
Do not touch the interior of the reconstructed dwellings or the structural supports of the exhibits.
