Mount Osore: Exploring Japan’s Gateway to the Underworld
In the remote Shimokita Peninsula of Aomori Prefecture lies a landscape so desolate and otherworldly that it has long been feared and revered as the entrance to the afterlife. Mount Osore, or Osorezan (literally “Fear Mountain”), is not merely a geographical feature; it is a spiritual borderland where the boundary between the living and the dead is said to be at its thinnest. With its barren, sulfurous terrain contrasted against the serene, turquoise waters of Lake Usori, Osorezan offers a travel experience unlike any other in Japan—one steeped in sorrow, hope, and ancient mythology.
Origins: A Landscape of Hell and Paradise
Mount Osore is considered one of Japan’s three most sacred places, alongside Mount Hiei and Mount Koya. Its spiritual history dates back to 862 AD during the Heian period. According to temple records, the renowned monk Ennin (also known as Jikaku Daishi) established the Bodai-ji temple here. Legend says Ennin had a dream in which a holy figure told him to travel north until he found a sacred mountain that resembled the world of the Buddha—a place featuring eight peaks surrounding a lake, just like a lotus flower.
When Ennin arrived at the volatile caldera of Osorezan, he found exactly what he had envisioned. The geography perfectly mirrored Buddhist descriptions of the afterlife. The area is geologically active, filling the air with the stench of rotten eggs (sulfur) and scarring the earth with grey, volcanic rock. Yet, in the center lies the highly acidic, yet breathtakingly beautiful, Lake Usori with its white sandy beaches. This stark duality—the hellish volcanic vents sitting beside a paradisiacal beach—cemented Osorezan’s reputation as a physical manifestation of the Buddhist cosmos.
The Legend: Crossing the Sanzu River
Central to the legends of Mount Osore is the Sanzu River (Sanzu-no-kawa), the Japanese Buddhist equivalent of the River Styx. It is believed that after death, souls must cross this river to reach the afterlife. At Osorezan, a vermilion arched bridge spans a small stream acting as this mythical boundary. Visitors are told that evil souls see the bridge as a mountain of needles, unable to cross, while the pure of heart can pass easily.
Perhaps the most poignant legend concerns the Sai-no-Kawara, or the riverbank of judgment. As you walk through the rocky, volcanic grounds, you will see countless small piles of stones. These are associated with the souls of children who passed away before their parents. According to folklore, these children are unable to cross the Sanzu River because they have not accumulated enough good deeds and have caused their parents sorrow. They are doomed to pile stones into stupas for eternity.
However, the story has a savior: Jizo Bosatsu. Jizo is the guardian deity of travelers and children. Legend holds that Jizo protects these children from demons and hides them in his robes. This is why the grounds of Osorezan are covered in colorful pinwheels; grieving parents plant them in the volcanic rock to comfort the spirits of their lost children, creating a heartbreakingly beautiful sound as they spin in the wind.
Modern Culture: The Itako Mediums
While the legends are ancient, the culture of Osorezan remains vibrant today, primarily due to the Itako. Itako are blind female mediums who undergo rigorous ascetic training. They are famous for their ability to perform kuchiyose—a ritual where they channel the spirits of the dead to speak with the living.
Twice a year, during the Osorezan Taisai Festival (usually in late July) and the Fall Festival (October), crowds descend upon the mountain. Lines form early in the morning as people wait hours for a chance to sit with an Itako. The medium chants sutras and falls into a trance, delivering messages from deceased loved ones. Even in modern, high-tech Japan, this shamanistic tradition persists, highlighting a deep cultural need for closure and connection with ancestors.
Traveler’s Tips for Visiting Osorezan
Visiting Mount Osore is a somber, atmospheric journey. Here is how to navigate this sacred space respectfully:
- Access: The mountain is remote. From JR Shimokita Station, it is a 45-minute bus ride. Buses are infrequent, so check the schedule carefully.
- Seasonal Closure: Due to heavy snowfall in northern Japan, Osorezan Bodai-ji is closed from November to April. The best time to visit is late spring through early autumn.
- Temple Stay: For a truly immersive experience, visitors can stay at the shukubo (temple lodging) at Bodai-ji. This includes vegetarian Buddhist meals (shojin ryori) and morning prayers.
- Onsen: Uniquely, there are hot spring baths located within the temple grounds. The acidic waters are considered holy and healing, but visitors should be mindful of the strong sulfur content.
- Etiquette: This is a site of mourning. Avoid taking photos of grieving families or the Itako during their rituals. Treat the stone piles and pinwheels with utmost respect—do not disturb them.
Sources & Further Reading
For those interested in the deep mythological roots of Japan’s afterlife, the Kojiki (Records of Ancient Matters) and Nihon Shoki (Chronicles of Japan) provide the foundational myths of Yomi-no-kuni (the land of the dead), which predate and later merged with the Buddhist concepts seen at Osorezan. Specifically regarding the mountain’s history, the Jikaku Daishi Den (The Biography of Jikaku Daishi Ennin) details the founding of the temple in the 9th century.