Four Stone Circles on an Akita River Terrace
On a river terrace in northern Akita Prefecture, four prehistoric stone circles sit clustered within a few hundred meters of one another. No other site in Japan has this many. The Isedōtai Site, in the Wakigami district of Kitaakita City, is a Jomon-period ritual ground and cemetery built roughly 4,000 years ago, at the start of what archaeologists call the Late Jomon period. It was protected as a National Historic Site on January 29, 2001, and in July 2021 it joined the UNESCO World Heritage List as one of the seventeen "Jomon Prehistoric Sites in Northern Japan."
The terrace stands 42 to 45 meters above sea level, hemmed in by two small rivers that feed the Yoneshiro. Salmon and trout once ran up these waters, and the slopes behind held broadleaf forest. For a people who neither farmed nor herded, this was a productive place to gather, and to bury and remember their dead.
A Site Found by Accident
Isedōtai came to light because of an airport. In 1995 and 1996, ahead of building an access road to the new Ōdate-Noshiro Airport, the Akita Prefectural Archaeological Center carried out a salvage excavation across the terrace. What the survey turned up was not a thin scatter of postholes but textbook stone circles, well preserved and unmistakable. Their importance was clear enough that the road plan was set aside and the site kept in place. Local education authorities then dug for years more to map its full extent.
What they pieced together was a planned landscape. Jomon builders had cut into the plateau to level it, shaped a terrace along the northeastern edge, dug a shallow ditch to mark off space, and laid out arrangements of stone. Across the southern half ran another set of divisions, with pottery deliberately buried in the ground and pit graves dug nearby. This was not a place that grew up by chance. It was designed.
Why the Stones Matter
Why does a field of stones rank among Japan's most significant archaeological sites? The answer lies in scale and concentration. The four circles, labeled A through D, are each more than 30 meters across, and the largest reaches about 45 meters. Finding even one such monument is notable. Finding four side by side is unique in the Japanese record.
Circle A, in the northeastern corner, is the one excavators came to understand completely. A line of stones on its north side appears to mark an entrance, and its central ring was assembled from roughly 1,500 river cobbles set out in an oval about 30 by 25 meters. Circle C, to the south, is larger still, at around 45 by 42 meters. Rows of post buildings stood along the outer edges of the circles, rectangular structures raised on six pillars with the ridge supports projecting slightly outward.
Beneath and around the stones lay pit graves. The circles were cemeteries, but they were also stages for ceremony, and the two roles cannot be separated. For archaeologists, Isedōtai offers an unusually full picture of how a Jomon community in northern Tohoku organized burial, ritual, and the considerable labor of construction. Protecting that combination of evidence is what the Historic Site listing was meant to do.
What to Look For on the Ground
Follow the looped path through the site and the experience shifts as the trees open up. Where the circles cluster at the terrace edge, the ground falls away and the Shirakami-Sanchi range comes into view on the horizon. It is worth standing here for a moment. The people who built these circles chose this spot, and the sightline to distant mountains may well have mattered to them.
The stones themselves repay a close look. They were not picked up at random. More than twenty kinds of rock have been identified, gathered from the Yoneshiro, Koshōppe, and Yuguruma rivers and carried up to the terrace by hand. Among the arrangements is a so-called sundial-type setting, an upright stone ringed by others, of a kind known from several northern Jomon circles.
The objects recovered here speak to a rich ceremonial life. Excavators found clay figurines, animal-shaped clay pieces, bell-shaped clay objects, three-legged stone tools, stone swords, and stone tablets, alongside the everyday gear of arrowheads, drills, and stone knives. The single most celebrated find is a plate-shaped clay figurine. It emerged in fragments from a pit grave inside Circle B and is the only figurine from the site that could be pieced back to a complete form. It measures 18.8 centimeters tall, 13 centimeters wide, and just 1.5 centimeters thick, and was itself designated an archaeological cultural property in 2011.
That figurine is now the centerpiece of the Isedōtai Jomon Museum, the guidance facility beside the site, which opened in April 2016. A giant model of it greets visitors at the entrance. Inside, around 300 artifacts are on display, including a gathering of 48 clay figurines unearthed from sites across Kitaakita City. The museum screens an introductory film in Japanese, English, Chinese, and Korean, and runs hands-on sessions where visitors can try making magatama beads or shaping pottery.
Planning a Visit and What Lies Nearby
The site opens by season. Because freezing and thawing can damage the stones, the circles are closed from November through late April. The museum's calendar governs access, and when the museum is shut the site is too. Both open at nine in the morning. On weekends and holidays, volunteer guides lead walks of about half an hour, though these need to be booked roughly two weeks ahead.
Reaching Isedōtai is straightforward by rural Japanese standards. The site sits within a short radius of three transport links: Ōdate-Noshiro Airport, the Isedōtai interchange on the expressway, and Jomon-Ogata Station on the Akita Inland Railway, the last about a ten-minute walk away. For that reason the site is often treated as a natural starting point for a wider tour of the northern Jomon World Heritage cluster, which also includes the larger Ōyu Stone Circles, elsewhere in Akita.
Near the museum, look for the rice-paddy art that local farmers plant each year and a stand of lotus raised from an ancient variety. Sannai-Maruyama, the best known of all the Jomon sites, lies across the prefectural border in Aomori and slots easily into a longer trip.
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Q&A
- When is the best time to visit?
- The site is open only from late April through the end of October, so any visit must fall in that window. Late spring through autumn all work well, with the surrounding greenery and the mountain views at their best, and the volunteer guide program runs through the season.
- How much time should I allow?
- About two hours is comfortable. The looped path through the circles takes 30 to 40 minutes at an unhurried pace, and the museum deserves a similar amount of time, more if you join a guided walk or a hands-on session.
- Are the stone circles originals, and can I get close to them?
- Yes on both counts. You walk among the actual excavated circles, not reconstructions, and the stones remain where they were found. This is also why the site closes in winter, since the original stones need protection from frost damage.
- Is the museum manageable for non-Japanese speakers?
- Reasonably so. The introductory film is offered in English, Chinese, and Korean as well as Japanese, the museum has free Wi-Fi and standard visitor facilities, and an audio guide is available separately. Volunteer guiding of the grounds, however, is conducted in Japanese.
- How does Isedōtai compare with other Jomon sites?
- Isedōtai is defined by its four adjacent stone circles, a concentration found nowhere else. The Ōyu Stone Circles in Akita and Komakino in Aomori are also circle sites worth pairing with it, while Sannai-Maruyama in Aomori shows a different side of Jomon life, a large settlement rather than a ceremonial ground.
Basic Information
| Name | Isedōtai Site (Isedōtai Iseki) |
|---|---|
| Location | Wakigami, Kitaakita City, Akita Prefecture |
| Designation | National Historic Site (criterion: shell mounds, settlement remains, tombs and similar sites) |
| Designated | January 29, 2001 |
| World Heritage | Inscribed July 2021 as a component of "Jomon Prehistoric Sites in Northern Japan" |
| Period | Early Late Jomon period, roughly 2,000–1,700 BCE |
| Main features | Four stone circles (A–D), pit graves, post-building remains, storage pits, ditch features |
| Guidance facility | Isedōtai Jomon Museum (adjacent; free admission, opened April 2016) |
| Opening | 9:00–17:00, last entry 16:00; closed November to late April; closed when the museum is closed |
| Access | About a 10-minute walk from Jomon-Ogata Station (Akita Inland Railway); about 5 minutes by car from Ōdate-Noshiro Airport or the Isedōtai interchange |
References
- National Database of Designated Cultural Properties, Agency for Cultural Affairs — Isedōtai Site
- https://kunishitei.bunka.go.jp/bsys/maindetails/401/3277
- Jomon Prehistoric Sites in Northern Japan (Official) — Isedōtai Site
- https://jomon-japan.jp/learn/jomon-sites/isedotai
- Kitaakita City — Isedōtai Site
- https://www.city.kitaakita.akita.jp/isedotai
- Akita Prefecture — Isedōtai Site (UNESCO World Cultural Heritage)
- https://www.pref.akita.lg.jp/pages/genre/37036
Last verified: 2026.05.23