MEGURI Research
Yatsugatake — Sacred Mountains of the Centre
Japan's spiritual heartland for 10,000 years. Where Jomon civilization flourished, obsidian powered a continental trade network, and modern seekers gather again at the foot of eight sacred peaks.
2,899m
Highest Peak (Akadake)
Tallest in the Yatsugatake range
5,000+
Years of Jomon Settlement
Togariishi site, c. 3000 BCE
80%
Japan's Jomon Obsidian from Kirigamine
Nagano Prefectural Museum estimate
1,300+
Years of Suwa Taisha Worship
Oldest shrine in Shinano Province
Why "Eight"? — The Mythology of the Peaks
The name Yatsugatake literally means "Eight Peaks" (八ヶ岳), but the range actually contains far more than eight summits. In Japanese sacred numerology, eight (八) is the number of infinity and abundance — the kanji itself widens at the base, symbolising ever-expanding prosperity. Izanagi and Izanami created Oyashima (大八島), the "Great Eight Islands" of Japan. Yaoyorozu-no-kami (八百万の神) — the "eight million gods" — uses eight as a prefix for the uncountable.
To name a mountain range "eight" was to call it sacred, boundless, a place where the finite meets the infinite. Geologically, Yatsugatake is one of Japan's oldest volcanic complexes — approximately 1.3 million years old, predating Mount Fuji by over a million years. The Jomon people who settled here were not choosing arbitrarily. They were drawn to the oldest mountains in the region, the ones that had always been there.
Jomon Heartland — 5,000 Years of Civilization
The Yatsugatake foothills were the demographic and cultural centre of Middle Jomon civilization (c. 3500-2500 BCE). Population density here exceeded anywhere else in the Japanese archipelago. This was not wilderness — it was the capital of a sophisticated culture that produced some of the finest art of the ancient world.
Togariishi Ruins (尖石遺跡)
One of Japan's most significant Jomon archaeological sites, designated a National Special Historic Site. Excavated from 1929 by local schoolteacher Miyasaka Fujiichi. The site yielded the famous 'Jomon Venus' (Jomon no Venus) dogu figurine (c. 2500 BCE), designated a National Treasure in 2014. Over 2,000 pit dwellings discovered across the complex.
Idojiri Ruins (井戸尻遺跡)
Located in Fujimi, Nagano. Famous for elaborate Jomon pottery with water and serpent motifs suggesting a sophisticated cosmological worldview. The 'Half-Human Half-Frog' vessel is an icon of Jomon art. Idojiri Archaeological Museum houses over 2,000 artifacts. The pottery here suggests rituals connected to agricultural fertility and water worship.
Shakado Ruins (釈迦堂遺跡)
Discovered during highway construction in 1980. Produced over 1,100 dogu figurines — the largest collection from a single site in Japan. The sheer volume suggests this area served as a major ceremonial center. Located just south of the Yatsugatake foothills in Kasai, Yamanashi, linking the mountain region to the broader Jomon cultural network.
Obsidian was the silicon of the ancient world — and Yatsugatake was its Silicon Valley.
— Archaeological interpretation
Obsidian — Jomon's Silicon Valley
Control of obsidian was the foundation of Jomon power. The volcanic glass from Kirigamine plateau — directly adjacent to Yatsugatake — was traded across the entire Japanese archipelago and may have reached the Korean Peninsula. This was not primitive barter. It was a sophisticated distribution system that sustained complex social structures for millennia.
Kirigamine Obsidian (霧ヶ峰黒曜石)
The Kirigamine plateau, adjacent to Yatsugatake, was the single largest obsidian source in prehistoric Japan. Chemical analysis (X-ray fluorescence) can trace specific obsidian artifacts across the archipelago back to Kirigamine quarries. Obsidian from here has been found in sites from Hokkaido to Kyushu — a distribution network spanning over 1,500 km.
Jomon Trade Network
Yatsugatake obsidian powered a continental-scale trade network 5,000 years ago. The material was the most prized toolmaking substance of the Jomon period — sharper than surgical steel when knapped correctly. Control of obsidian sources likely conferred political and spiritual authority. Archaeologist Tatsuo Kobayashi called this network 'the foundation of Jomon civilization.'
The Suwa Connection — Mountains, Myths, and Kami
Suwa Taisha, one of Japan's oldest shrines, sits at the foot of Yatsugatake. The relationship between the shrine and the mountains encodes layers of spiritual history — from pre-Yamato indigenous worship to imperial myth-making.
One of the oldest shrines in Japan, with origins predating the Yamato court. Suwa Taisha has four complexes (Kamisha Honmiya, Kamisha Maemiya, Shimosha Harumiya, Shimosha Akimiya) surrounding Lake Suwa at the base of Yatsugatake. The deity Takeminakata-no-kami was, according to the Kojiki, defeated by Takemikazuchi and fled to Suwa — but local traditions suggest Takeminakata was the indigenous god of this region long before the Yamato mythology absorbed him. The shrine has no main hall (honden) — the mountain itself is the sacred body (shintai).
Japanese mythology tells of a contest between Yatsugatake and Mount Fuji over which was taller. Yatsugatake was originally one massive peak, taller than Fuji. In her jealousy, the goddess Konohanasakuya-hime (deity of Fuji) struck Yatsugatake's summit with a great chain, shattering it into eight peaks. This is why Yatsugatake has eight summits and Fuji stands alone. Geologically, Yatsugatake is indeed the older volcanic system (approximately 1.3 million years old vs. Fuji's 100,000 years). The myth encodes a geological truth: Yatsugatake was here first.
Every six years, massive fir trees (up to 17 meters, one ton each) are felled from Yatsugatake's forests and dragged by hand through the streets to Suwa Taisha. Men ride the logs downhill in the terrifying 'Kiotoshi' (木落とし). This festival, with origins possibly in the Jomon period, is one of Japan's most dangerous and archaic rituals. The pillars are erected at each corner of the shrine grounds — a practice that resonates with sacred pillar traditions across Eurasia. 200,000+ participants over 12 days.
The mountain does not come to you. You go to the mountain. This is the first teaching.
— Japanese mountain worship saying
Mountain Worship — Sangaku Shinko
Long before Buddhism arrived in Japan, mountains were already sacred. Yatsugatake's peaks were boundaries between the human world and the world of spirits. To climb was to purify. To descend was to return transformed.
Sangaku Shinko (山岳信仰)
Mountain worship in Japan predates organized religion. Yatsugatake's peaks were seen as the dwelling places of kami and the realm of the dead. The practice of climbing mountains as spiritual purification (tohai) continues today. Akadake, the highest peak, is home to a small shrine at its summit where climbers offer prayers.
Shugendo Routes
Yatsugatake served as a training ground for yamabushi mountain ascetics. The range's harsh alpine environment — sudden fog, extreme cold, vertical rock faces — was considered ideal for spiritual transformation through physical ordeal. Several trails still follow ancient shugendo routes, marked by stone markers and small stone shrines (hokora).
Modern Seekers — 10,000 Years Later, They Return
Something extraordinary is happening at Yatsugatake. Organic farmers, healers, artists, and spiritual seekers are congregating in the same foothills where Jomon people built their civilization. They are not drawn by archaeology — most know nothing of the Jomon sites. They are drawn by the same force that drew their ancestors: something in this landscape that speaks to the human spirit.
Since the 1970s, Yatsugatake's foothills have attracted seekers building alternative lifestyles. Organic farms, permaculture communities, and healing spaces cluster around Kobuchisawa, Fujimi, and Hara. The region is home to Japan's densest concentration of organic farmers per capita. Many residents describe being 'called' to the mountains. The pattern echoes Sedona (Arizona), Glastonbury (England), and Ubud (Bali) — places where spiritual seekers spontaneously congregate, generation after generation.
American educator Paul Rusch (1897-1979) established the Kiyosato Educational Experiment Project (KEEP) in 1938, building Seisenryo as a training center for rural leadership. After the war, he returned to rebuild the community, establishing Japan's first Jersey cattle farm and the model for agricultural tourism in the highlands. Seisenryo became a gateway for urbanites to experience Yatsugatake. Rusch saw the mountains as a place of spiritual renewal — his vision anticipated the modern wellness retreat movement by decades.
Visitors consistently report feeling 'different' in the Yatsugatake highlands. While subjective, there are measurable factors: negative ion concentration increases significantly above 1,000m (Japan Forest Therapy Society measurements). Air pressure at 1,200m is roughly 87% of sea level, subtly altering blood oxygen dynamics. Average temperatures are 6-8 degrees C lower than Tokyo. The combination of clean air, reduced electromagnetic interference, and altitude-induced physiological shifts may explain why mountain regions worldwide become spiritual gathering points. Tibetan monasteries, Andean sacred sites, and the Hindu Himalayan tradition all center on this altitude band.
Yatsugatake is one of Japan's premier stargazing regions. Nobeyama (elevation 1,350m) hosts the National Astronomical Observatory of Japan's 45m millimeter-wave radio telescope — the largest of its kind when built in 1982. The area's low light pollution and dry highland climate create some of Japan's best astronomical viewing conditions. Multiple star festivals draw thousands annually. For Jomon people, the stars would have been overwhelming here — and many dogu figurines have been interpreted as depicting celestial beings or star maps.
The Yatsugatake area hosts several intentional communities inspired by the Israeli kibbutz model and other communal living experiments. Kibbutz Yatsugatake operates an organic farm and hosts agricultural volunteers. These communities represent a continuation of a deep pattern: humans gathering at the foot of these mountains to build shared spiritual and material lives. From Jomon pit-dwelling villages to modern eco-villages, the impulse is the same — Yatsugatake draws people into community.
The SBNR Significance — Why Yatsugatake Matters Now
Yatsugatake is not a pilgrimage destination in the traditional sense. There is no single temple, no famous gate, no prescribed ritual. Instead, it offers something rarer: a landscape where the boundary between the spiritual and the mundane has been thin for ten thousand years. The Jomon people felt it. The Suwa priests codified it. The yamabushi trained in it. And now, a new generation of seekers — many identifying as SBNR — are rediscovering it without any historical instruction.
This is perhaps the most powerful evidence for something real in these mountains: people keep coming back, across millennia, without being told to. The obsidian is gone. The Jomon villages are ruins. The yamabushi trails are overgrown. Yet the pull remains. For the spiritual seeker who distrusts institutions but trusts direct experience, Yatsugatake offers exactly what is needed: a place where the land itself is the teacher, and 10,000 years of human spiritual response is the testimony.
Sources & References
- Kobayashi, Tatsuo. Jomon Reflections. Oxbow Books, 2004.
- Habu, Junko. Ancient Jomon of Japan. Cambridge University Press, 2004.
- Togariishi Jomon Archaeological Museum. Exhibition materials and site reports.
- Idojiri Archaeological Museum. Catalogue of Jomon Pottery. Fujimi Town Board of Education.
- Nagano Prefectural Museum of History. "Obsidian Trade Routes in the Jomon Period." Exhibition catalogue, 2018.
- Suwa Taisha shrine records and Onbashira festival documentation.
- Miyasaka, Fujiichi. Excavation records of Togariishi (1929-1965).
- Japan Forest Therapy Society. Negative ion measurements at various altitudes, 2019.
- Rusch, Paul. Kiyosato: A Model for Rural Development. KEEP Association archives.
- National Astronomical Observatory of Japan. Nobeyama Radio Observatory historical overview.