Osorezan is a sacred mountain in Mutsu City, Aomori Prefecture, and is regarded as one of Japan’s Three Sacred Places, together with Mount Hiei and Mount Koya. The name Osorezan refers not to a single mountain, but to the volcanic caldera area surrounding Lake Usoriyama, with Mount Kamabuse rising to 878 meters as its highest point.
For centuries, Osorezan has been associated with the afterlife. A traditional saying in the region holds that “when people die, they go to Osorezan.” Because of this belief, the mountain has long been regarded as a special place where the world of the living and the world of the dead come close together.
The landscape is unlike almost anywhere else in Japan. Little vegetation grows in some parts of the mountain, while volcanic gases rise from the ground and the air carries the strong smell of sulfur. The barren landscape can resemble the traditional Buddhist image of hell.
Yet just a short distance away, the shores of Lake Usoriyama feature a beautiful white-sand beach and calm, clear water. This peaceful scenery evokes the image of a Buddhist paradise. The coexistence of these two contrasting landscapes—hell and paradise—is one of the defining characteristics of Osorezan.
The religious history of Osorezan is traditionally traced back to 862, when it is said to have been opened by Jikaku Daishi Ennin, a prominent monk of the Tendai school of Buddhism.
According to legend, while Ennin was studying in Tang China, he received a vision telling him that there was a sacred mountain in the east where he should enshrine Jizo Bodhisattva and spread the teachings of Buddhism. After returning to Japan, he traveled throughout the country in search of this sacred place and eventually arrived at Osorezan.
There, he is said to have carved an image of Jizo Bodhisattva and established Osorezan Bodaiji Temple. The temple remains the spiritual center of Osorezan today.
Jizo is traditionally regarded as a compassionate figure who protects people from suffering and watches over the souls of the dead. At Osorezan, devotion to Jizo has become especially closely connected with prayers for deceased family members and loved ones.
Throughout the temple grounds and surrounding area are a number of places whose names and landscapes are associated with Buddhist ideas of the afterlife. Jigokudani, or “Hell Valley,” is characterized by sulfurous smells, barren ground, volcanic rocks, and steam rising from the earth.
Another area, known as Chinoike Jigoku, or “Blood Pond Hell,” features reddish volcanic rock and soil. These stark landscapes have traditionally been interpreted as representations of the suffering and trials believed to await souls after death.
Sainokawara is another deeply symbolic area of Osorezan. According to Buddhist folk beliefs, it is associated with children who died before their parents. Visitors may see small piles of stones built as offerings or prayers for these children.
Colorful pinwheels can also be found turning in the mountain wind beside the stone piles. The sight is both beautiful and deeply moving, expressing the grief of parents and the hope that departed children will find peace.
In striking contrast to the barren volcanic landscape is Gokurakuhama, or “Paradise Beach,” on the shore of Lake Usoriyama. Its white sand and tranquil water create an atmosphere of remarkable serenity.
The sudden transition from sulfurous valleys and barren rocks to a peaceful lakeshore is one of the most powerful experiences at Osorezan. It symbolizes the contrast between suffering and peace, death and rebirth, and the worlds of hell and paradise.
Every year from July 20 to 24, Osorezan hosts the Osorezan Grand Festival, one of the most important religious events at the sacred site. An autumn pilgrimage, known as Osorezan Aki-mairi, is also held later in the year, attracting worshippers from across Japan.
During these religious gatherings, visitors may encounter Itako, traditional female spiritual mediums associated with the Tohoku region. Through a practice known as kuchiyose, an Itako is traditionally believed to communicate messages from the spirits of deceased people.
For people mourning a family member or someone they deeply cared about, this practice has provided a way to feel connected with those who have passed away. Visitors gather quietly to listen, often with deep emotion, as the medium conveys words believed to come from their deceased loved ones.
The tradition of the Itako is an important part of the spiritual culture associated with Osorezan. Even for travelers who do not share these beliefs, witnessing the atmosphere of the pilgrimage can provide insight into the ways Japanese communities have traditionally understood death, mourning, and remembrance.
Osorezan is a volcanic landscape formed by eruptions more than 10,000 years ago. Even today, sulfurous steam and gases emerge from the ground, creating the distinctive landscape and atmosphere of the sacred site.
The volcanic activity has also produced natural hot springs. Within the temple grounds are four communal bathhouses where visitors can bathe free of charge. The mineral-rich water has a strong sulfur smell, and bathing has traditionally been regarded as a way to cleanse both body and mind.
For visitors staying overnight, the temple lodging facility Jishokaku offers an opportunity to experience Osorezan beyond a daytime visit. Guests can take part in practices such as morning prayers and sutra copying, experiencing the quiet atmosphere of the sacred mountain at a slower pace.
Lake Usoriyama lies at the center of the Osorezan caldera. The lake was formed when rainwater accumulated in a depression created by volcanic activity.
The lake water is strongly acidic because of hydrogen sulfide associated with the volcanic environment. Despite its harsh chemical conditions, the water is remarkably clear and can appear emerald green depending on the light.
Very few living organisms can survive in such an environment, although certain species, including small fish such as Japanese dace and blue damselflies, can occasionally be found around the lake.
The contrast between the beautiful water of Lake Usoriyama and the rugged volcanic landscape surrounding it is central to the character of Osorezan. The scenery seems almost unreal, reinforcing the mountain’s long-standing association with the boundary between this world and the next.
Osorezan is a place where life and death, hell and paradise, nature and religious faith exist side by side. The volcanic landscape was shaped by powerful natural forces, while more than a thousand years of prayer and religious tradition have given the mountain its spiritual significance.
For many visitors, Osorezan is more than a sightseeing destination. The silence of the mountains, the smell of sulfur, the barren volcanic ground, the white sands of Paradise Beach, and the Buddhist memorial traditions invite visitors to reflect on mortality, loss, remembrance, and the meaning of life.
The traditional expression that people “go to Osorezan after they die” captures the special place the mountain holds in the imagination of the people of northern Japan. Here, visitors can remember those who have passed away while also taking time to look inward and consider their own lives.
Standing between the world of the living and the imagined world of the dead, Osorezan offers one of the most distinctive spiritual landscapes in Japan. Its unusual combination of sacred traditions, volcanic scenery, and profound tranquility makes it an unforgettable destination for travelers seeking to understand a deeper side of Japanese culture.
60 minutes from Nobechi Station to Shimokita Station on the JR Ominato Line. From Shimokita Station, 45 minutes by Shimokita Kotsu Bus to Osorezan. 25 minutes by cab.