Pirika Site: Walking the Hill Where Hokkaido's Ice Age Hunters Crafted Stone
On a quiet hilltop in southern Hokkaido, where the Shiribeshi-Toshibetsu River meets the Pirika-betsu River, a remarkable archaeological landscape preserves the daily lives of Paleolithic people who lived here roughly 20,000 years ago. The Pirika Site (ピリカ遺跡), designated a National Historic Site of Japan in 1994, is one of the largest and most significant Late Paleolithic stone tool workshops ever discovered in the country. The name "Pirika" comes from the Ainu language and means "beautiful," a fitting tribute to both the gentle, river-carved scenery and the astonishing craftsmanship found in the soil here.
For travelers fascinated by deep human history—those who have stood before the cave paintings of Lascaux or the megaliths of Stonehenge—Pirika offers a quieter, more intimate encounter with our shared Ice Age past. Here, you can stand where small bands of hunters once rested, knapped stone, and watched the seasons turn in a Hokkaido that was colder, drier, and connected by land to the Asian continent.
A Site Discovered by Accident
The Pirika Site was found in 1978 during a most unromantic process: soil testing. Engineers from the Hakodate Development and Construction Department were investigating the surrounding hills for clay suitable for the embankment of the planned Pirika Dam. To their surprise, the test pits began turning up stone tools.
Realizing the significance of the find, the Hokkaido Center for Buried Cultural Properties carried out a full-scale excavation across about 1,585 square meters of the site between 1983 and 1984. The results were extraordinary. The dam project was modified so that clay would be sourced elsewhere, and the site was preserved in place. Subsequent investigations by the Imakane Town Board of Education from 1987 onward, and a long-running research project by Kokugakuin University starting in 1996, gradually revealed the true scale of the settlement.
Today the entire site spans roughly 200,000 square meters across two parallel hill ridges. In 1994 (Heisei 6), about 99,090 square meters of this area were designated a National Historic Site, recognizing it as a cultural treasure of exceptional importance.
Why Pirika Was Designated a National Historic Site
What makes Pirika so significant is not simply the volume of artifacts—though more than 200,000 stone tools have been recovered—but the way they were preserved. Within a single clay layer roughly one meter thick, archaeologists identified three distinct cultural horizons stacked one above the other, allowing them to read the technological evolution of Paleolithic toolmaking like the chapters of a book.
Three Layers, Three Eras
The lowest layer contains Tōgeshita-type microblade cores and Araya-type burins, representing some of the oldest tool traditions in Hokkaido. The middle layer features microblade cores produced using the Yubetsu technique alongside Rankoshi-type cores, while the uppermost layer holds tanged points, large bifacially flaked points, and stone axes finished with both flaking and partial polishing. This vertical record of change is rare anywhere in the world.
Important Cultural Property Designation
From the immense assemblage, 163 representative artifacts—including refitted stone tool sets that show the actual sequence of flake removal—have been designated Important Cultural Properties of Japan. Among them are spear points up to 33 centimeters long and exquisitely small ornamental beads, the latter being some of the earliest known jewelry in the Japanese archipelago. Remarkably, several beads are made from dunite, a stone not found in Japan, suggesting trade or movement across what is now the Sea of Japan.
Highlights and Things to See
The Pirika Paleolithic Cultural Museum
Opened in June 2003 directly adjacent to the historic site, the Pirika Paleolithic Cultural Museum (ピリカ旧石器文化館) is the gateway to the entire experience. The museum is compact but thoughtfully designed. A large screen presents an introductory film, and the Paleolithic exhibition hall walks visitors through the lives of Ice Age people with multilingual touch panels in Japanese, English, and Chinese. The Important Cultural Property gallery displays all 163 designated artifacts in person—an opportunity rarely offered for objects of this stature. Best of all, admission is free.
The Stone Tool Workshop Display
A short walk uphill from the museum brings you to a covered structure built directly over an excavated section of the site. Inside, you can see clusters of stone tools exactly as they were found, frozen in the moment a Paleolithic craftsman set them down. The density of artifacts is breathtaking and conveys, more vividly than any reconstruction, that this hill was a busy, repeatedly visited workshop.
Hands-On Stone Tool Making
For visitors who want to engage with the past physically, the museum offers stone tool making experiences (advance reservation required). Under the guidance of skilled instructors, you can try your hand at flaking siliceous shale—the same material the original inhabitants prized—and feel for yourself why this craft demanded years of training. Leather accessory making is also offered as a family-friendly alternative.
The View from the Hill
Take a moment, before leaving, to simply stand at the top of the site. The view across the river valleys is much the same one that Paleolithic hunters would have surveyed roughly 20,000 years ago, watching for game and judging the weather. Few places in Japan offer such an immediate, unmediated connection to the deep human past.
Around the Area
The Pirika area sits in a peaceful corner of the Oshima Peninsula and pairs well with a longer southern Hokkaido itinerary.
- Pirika Dam and its scenic reservoir, just minutes from the site, offering walking paths and seasonal views of the surrounding mountains
- Imakane Onsen, where travelers can soak in local hot springs after a day of exploration
- The town of Setana on the Sea of Japan coast, known for sunset views over the Mitsuishi rocks
- Mount Komagatake and the resort town of Hakodate, both within reasonable driving distance for a multi-day trip
- Kunnui Station area, a useful base for those traveling by car along the expressway
- 📍 Plan Your Visit to Hokkaido
- Find tours, activities & transport passes near Pirika Ruins
- [ Explore Sapporo Snow Festivals & Lavender Fields ]
Q&A
- How old is the Pirika Site?
- The site was occupied during the Late Paleolithic period, with the oldest layer dated to roughly 20,000 years ago and the most recent activity around 12,000 years ago. People returned to this hill repeatedly over an estimated 8,000 years.
- How do I get to Pirika from Sapporo or Hakodate?
- By train, take the JR line to Oshamambe Station and transfer to the Hakodate Bus bound for Kaminohonsugi, getting off at "Pirika Dam Mae." The site is about a five-minute walk from the bus stop. By car, it is about 11 kilometers from the Kunnui Interchange on the Doō Expressway.
- Is the museum open year-round?
- No. The Pirika Paleolithic Cultural Museum closes for the winter from December 1 through March 31, and is also closed on Mondays and the day after national holidays. Snowfall in this region is heavy, so winter visits to the outdoor site are not practical.
- What does "Pirika" mean?
- "Pirika" is an Ainu word meaning "beautiful" or "good." The name describes both the surrounding scenery and is shared with the Pirika-betsu River that flows past the site.
- Can I actually see the original artifacts?
- Yes. The 163 items designated as Important Cultural Properties are displayed in person at the on-site museum, and a separate structure protects an excavated portion of the workshop, allowing visitors to view stone tools as they were unearthed.
Basic Information
| Name | Pirika Site (ピリカ遺跡) |
|---|---|
| Designation | National Historic Site (designated April 26, 1994) |
| Period | Late Paleolithic (approximately 20,000–12,000 years ago) |
| Total Site Area | Approximately 200,000 square meters (about 99,090 sq m designated) |
| Address | Pirika Paleolithic Cultural Museum: 228-1 Pirika, Imakane-cho, Setana-gun, Hokkaido 049-4151 |
| Hours | 9:30 – 16:30 |
| Closed | Mondays, day after national holidays, December 1 – March 31 (winter closure) |
| Admission | Free |
| Access | 5 minutes on foot from "Pirika Dam Mae" bus stop (Hakodate Bus from JR Oshamambe Station); approximately 11 km from Kunnui IC on Doō Expressway |
| Telephone | 0137-83-2477 (during open season) / 0137-82-3488 (Imakane Town Board of Education, off-season) |
| Notable Holdings | Over 200,000 stone tools recovered; 163 items designated Important Cultural Properties |
References
- 史跡 ピリカ遺跡 - 今金町公式サイト
- https://www.town.imakane.lg.jp/pirika/
- ピリカ旧石器文化館 - 今金町公式サイト
- https://www.town.imakane.lg.jp/pirika/cat629/post.html
- ピリカ遺跡 - 文化遺産オンライン (国指定文化財等データベース)
- https://bunka.nii.ac.jp/heritages/detail/137564
- ピリカ旧石器文化館 - 北海道デジタルミュージアム
- https://hokkaido-digital-museum.jp/facility/national-historic-site-pirika/
- ピリカ遺跡 - 北海道縄文のまち連絡会
- http://www.jomon-town.org/site/ピリカ遺跡/
- ピリカ遺跡 - コトバンク (国指定史跡ガイド)
- https://kotobank.jp/word/ぴりか遺跡-1444893
Last verified: 2026.04.26