Dewa Sanzan: Japan's Three Sacred Mountains of Yamagata
Dewa Sanzan — Haguro-san, Gas-san, and Yudono-san — form one of Japan's oldest pilgrimage circuits, practiced continuously for 1,400 years by yamabushi mountain ascetics in Yamagata Prefecture. This guide covers the stone-step cedar forest approach, summer alpine pilgrimage, the most sacred and restricted mountain in Japan, and the extraordinary preserved mummies of the Shonai region.
The Three Mountains and the Shinto Cosmology of Birth, Death, and Rebirth
Dewa Sanzan — the Three Mountains of Dewa — are among Japan's oldest and most spiritually significant pilgrimage sites, practiced continuously for over 1,400 years. The three mountains of Haguro-san (414m), Gas-san (1,984m), and Yudono-san (1,504m) each embody a distinct phase of the Shinto and Buddhist cosmological cycle. Haguro-san represents the present life (現在, genzai), Gas-san represents death (過去, kako), and Yudono-san represents rebirth (未来, mirai). Together they form the Sankan-sando pilgrimage circuit: a symbolic journey through life, death, and the world beyond. The Dewa Sanzan tradition is rooted in the Shugendo school of ascetic mountain practice, which fuses Shinto animism with esoteric Buddhism (particularly Tendai and Shingon). The syncretic nature of Dewa Sanzan means that a single visit weaves together rice straw rope shimenawa, torii gates, Buddhist statues, fire rituals, and the distinctive white robes of yamabushi mountain priests — all within a single mountain landscape. This combination makes Dewa Sanzan unlike any other pilgrimage site in Japan, distinct even from the better-known Koyasan (pure Shingon Buddhist) or Ise (pure Shinto). The practice of Shugendo at Dewa Sanzan is traced back to Prince Hachiko, a son of Emperor Sushun who came to the mountains in the late 6th century after his father was assassinated. He is said to have received divine instructions from a mysterious three-legged crow (yatagarasu) who guided him to the mountains. The resulting religious tradition — the Haguro school of Shugendo — has operated its mountain shrines and training programs continuously since that time, making it one of the longest unbroken spiritual lineages in Japan. Annual pilgrimages to all three mountains are undertaken by tens of thousands of Japanese each year, many wearing the traditional white pilgrim robes (白装束, shiroshozoku) and carrying wooden pilgrim staffs. Foreign visitors are increasingly welcome at the outer areas of each mountain, and yamabushi training programs now operate in multiple languages, offering visitors a genuine immersive introduction to one of Japan's most ancient spiritual disciplines.
Haguro-san — The 2,446 Steps Through a National Treasure Cedar Forest
The approach to Haguro-san's summit shrine is one of the most atmospheric walks in Japan. From the vermilion Zuishinmon gate at the base, a stone stairway of 2,446 steps winds upward through a cedar forest that includes trees estimated to be over 1,000 years old — many of these ancient cryptomeria are more than 4 meters in diameter at the base. The forest is so dense that even on bright summer days the path is cool and green-filtered, the stone steps mossy and worn from centuries of barefoot pilgrims. Approximately halfway up the stairs stands the five-story pagoda (五重塔, gojunoto) — a National Treasure of Japan built in the early 14th century (Nanbokucho period) and restored in the 17th century. The pagoda stands 29.2 meters tall and is considered one of the finest examples of Fujiwara-period architecture surviving in the Tohoku region. It is surrounded by a particularly ancient cedar grove, and the combination of the pagoda emerging from the ancient forest creates one of the most photogenic compositions in rural Japan. From the pagoda the stairway continues to the summit plateau. The summit of Haguro-san is home to the Sanjin Gosaiden — a large thatched-roof shrine hall that enshrines the deities of all three Dewa Sanzan mountains simultaneously. It is one of the largest thatched-roof buildings in Japan, and its sweeping roofline in the mountain mist is deeply memorable. The climb takes approximately 45 minutes to an hour at a comfortable pace; those who prefer can also reach the summit by road via a motor road with parking. However, arriving via the stone stairs is considered the proper pilgrimage approach and is strongly recommended for the full spiritual and physical experience. Haguro-san is the only one of the three Dewa Sanzan mountains that is accessible year-round. The summit plateau has several small restaurants and teahouses serving local Shonai dishes and buckwheat soba, and a small museum with artifacts from the mountain's 1,400-year history. Dawn and dusk on the summit, when light filters through the cedar crowns and the distant Shonai plain is visible through the mist, are among the most memorable moments available to visitors in northern Japan.
Gas-san — Summer Pilgrimage Through Snow, Alpine Flowers, and Crater Wetlands
Gas-san is the highest of the three mountains at 1,984 meters and is only accessible for pilgrimage and trekking from July through early September — snow persists on the upper slopes well into June, and the mountain is entirely closed from October through late June. The short open season makes Gas-san special: it draws concentrated streams of white-robed pilgrims during July and August against a backdrop of alpine flowers that bloom in fast succession precisely because the growing season is so compressed. The standard approach begins at the Haguro-san registration office at the 8th station (八合目), accessible by bus from Tsuruoka or by car. From there the trail climbs through the Midagahara wetlands — a high-altitude plateau covered in marshland flowers, dwarf birch, and the spectral pools of a volcanic landscape. On clear days the views northeast toward the Shonai coast and southwest toward the Asahi mountain range are extraordinary. The Midagahara wetlands are also an important habitat for alpine plants including the chinguruma (Geum pentapetalum), himesakura (alpine cherry), and the distinctive pink cotton-grass that sways in the summer wind. The upper summit area of Gas-san requires passing through a purification gate (禊所) and paying a small entry fee to enter the Shinto precincts around the crater. The summit shrine is dedicated to Tsukuyomi-no-Mikoto, the moon god — one of the three sibling deities born from Izanagi in the creation myth. The combination of exposed volcanic rock, residual snow fields even in August, and a functioning Shinto shrine at the summit creates an environment unlike anywhere else in Japan. Gas-san is also the second stage of the formal Sankan-sando pilgrimage circuit, descended after reaching the summit and before ascending to the most sacred mountain, Yudono-san. Many pilgrims complete Gas-san and Yudono-san in a single full day in July or August, beginning at first light and returning to Tsuruoka by evening. This is physically demanding (approximately 15km total with significant elevation change) but highly rewarding. Alternatively, staying overnight in a Haguro-san shukubo (temple lodging) allows for an unhurried three-day circuit.
Yudono-san — The Most Sacred and Most Restricted of the Three Mountains
Yudono-san is the most sacred of the three Dewa Sanzan mountains and is subject to the most significant restrictions of any pilgrimage site in Yamagata. Photography inside the sacred precinct is strictly forbidden. Visitors are required to remove their shoes before entering and approach barefoot — in all seasons. The reason for this is the central object of worship itself: a large reddish volcanic rock over which a natural thermal spring flows constantly at approximately 38°C. The mineral-rich water has stained the rock a deep ochre-red, and pilgrims traditionally touch the rock and receive the sacred salt-mineral water as a form of purification and blessing. The interior of the Yudono-san sacred precinct is not described in detail even in Japanese guidebooks, honoring a centuries-old tradition of maintaining the mystery of the site for those who have not made the pilgrimage in person. What is widely acknowledged is that the experience of entering barefoot over the mossy path, removing shoes at the threshold, and approaching the steaming sacred rock in silence is among the most viscerally moving experiences available in Japanese religious culture — a complete contrast to the visual spectacle of a Kyoto shrine or Buddhist temple. Access to Yudono-san involves a short but steep trail descent from the parking area, followed by a shuttle bus from the main approach road (the lower parking lots). The route is only open from May to October, and the summer months draw long queues of Japanese pilgrims. Foreign visitors are entirely welcome and the ritual is accessible without any prior preparation or religious commitment — simply removing shoes and proceeding respectfully is sufficient. A small purification fee (around ¥500) is charged at the gate. The nearby temples of Dainichibo and Churen-ji add additional depth to any visit to the Yudono-san area. Both contain the extraordinarily rare phenomenon of sokushinbutsu — the self-mummified monks — which are described in detail in the following section. From Yudono-san, the road connects easily to Tsuruoka for the return journey to Sendai or Tokyo.
Sokushinbutsu — The Self-Mummified Buddhist Monks of the Dewa Sanzan Temples
Among the most remarkable phenomena associated with the Dewa Sanzan tradition is the practice of sokushinbutsu (即身仏) — the voluntary mummification of living monks through an extreme ascetic process. Of the approximately 20 known sokushinbutsu in Japan, at least 8 are preserved in temples near Dewa Sanzan, making the Shonai region the densest concentration of this extraordinary practice in the world. The process of sokushinbutsu was practiced from roughly the 11th to 19th centuries and was officially prohibited by the Meiji government in 1879. The procedure involved a monk undergoing a 1,000-day diet (mokujikigyō) restricted to nuts, seeds, berries, and tree bark to reduce body fat. In the final stage, the monk would consume urushi lacquer tea (made from the same lacquer used in Japanese furniture) to make the body unpalatable to insects and bacteria after death. The monk was then sealed in a stone chamber with a bell and an air tube; when the bell stopped ringing, the chamber was sealed permanently. After three years, the chamber was opened to reveal whether mummification had occurred — a successful sokushinbutsu was considered to have achieved enlightenment in the living body (sokushinjobutsu) and was enshrined for veneration. Dainichibo Temple in Oami village (accessible by bus or taxi from Tsuruoka) preserves the sokushinbutsu of Tetsumonkai (died 1829), who is revered for having undergone eye surgery on himself before beginning the mummification process. Churen-ji Temple in Nishimonai preserves the sokushinbutsu of Tetsuryukai (died 1878), one of the last monks to undergo the process before it was outlawed. Both temples conduct guided explanations in Japanese with printed English information available, and both welcome respectful visitors. The atmosphere at each temple is profoundly quiet — these are active places of worship, not museums. A visit to both temples can be combined with the Yudono-san pilgrimage in a full day from Tsuruoka. The combination of the silent volcanic sacred spring of Yudono-san and the preserved monks at Dainichibo creates one of the most unusual and profoundly Japanese cultural experiences available to visitors in the Tohoku region — one that receives a fraction of the visitor numbers of Nikko, Aomori, or Matsushima despite offering experiences that are genuinely unique to this landscape.
Frequently Asked Questions
When is Dewa Sanzan open to visitors?
Haguro-san is accessible year-round. Gas-san and Yudono-san are open from approximately July through early October — Gas-san typically opens in early July after the snow melts and closes in mid-September. Yudono-san opens in late April and closes in early November. Check the Dewa Sanzan Shrine website for exact seasonal opening dates each year.
How do I get to Dewa Sanzan from Tokyo?
The most practical approach from Tokyo is the JR Shinkansen to Tsuruoka (via Niigata — Joetsu/Uetsu Line, approximately 4 hours total) or to Yamagata then west by local train. From Tsuruoka Station, buses run to the Haguro-san Zuishinmon gate (35 minutes) and to the Gas-san 8th Station (summer only). Renting a car in Tsuruoka is strongly recommended for Yudono-san and the surrounding temples.
Can you climb all three Dewa Sanzan mountains in one day?
Climbing all three in one day is physically demanding but possible in summer (July–August) with an early start. Gas-san and Yudono-san can be combined in a single day from the 8th Station. Haguro-san is a separate climb usually done the previous day. Most pilgrims doing the full Sankan-sando circuit spread the three mountains over two to three days, often staying overnight in a Haguro-san shukubo (temple lodging).
What is yamabushi training at Dewa Sanzan?
Yamabushi are mountain ascetic practitioners of Shugendo who undergo physical and spiritual training including waterfall meditation, fire rituals, mountain climbing in traditional dress (white robes, conch shell horn, wooden staff), and vegetarian Buddhist cuisine. Multi-day yamabushi experience programs are offered at Haguro-san for both Japanese and international visitors, typically running 2–5 days and including temple accommodation and meals.
Is photography allowed at Yudono-san?
Photography is strictly forbidden inside the main sacred precinct of Yudono-san. This prohibition is enforced by shrine attendants and should be respected. Photographs of the outer approach, the gate area, and the surrounding mountain landscape are permitted. The prohibition extends to video recording of any kind inside the inner shrine area.
Book Accommodation in Sendai
Sendai is the nearest major city with frequent Shinkansen connections to Tokyo and rail access to Tsuruoka — the gateway town for Dewa Sanzan.
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