Mount Ontake, a majestic volcano culminating at 3,067 metres above sea level, stands at the border of Nagano and Gifu prefectures on Honshū Island. This natural giant, both dreaded for its volcanic activity and venerated for its spiritual power, has fascinated hikers, pilgrims and travellers for centuries in search of nature, silence and connection.
An active volcano among the highest in Japan
Mount Ontake is Japan’s second highest volcano after Mount Fuji. This subduction stratovolcan, which consists mainly of diandesitis, basalt and dacite, is considered active. Long known extinct, it has experienced several eruptions in recent history: in 1979, 1991, 2007, and 2014, when a sudden water rash killed 53 people. Since that tragedy, a security perimeter has been maintained around the crater.
Despite this volcanic environment, the mountain remains a high hiking site, subject to safety recommendations and restrictions.
A sacred mountain in Japanese spirituality
For over a thousand years, Mount Ontake has been a major pilgrimage centre in Japan. It is associated with a unique spiritual tradition calledOntake-kō, mixture of Shintoism, esoteric Buddhism (shingon) and shamanic practices. This mountain religion (sangaku shinkō) considers the mountain as a living and divine entity.
Every summer, especially in July and August, white worshippers climb the mountain, recite prayers and perform purification rituals. The paths are marked with shrines, statues of deities and messages engraved in the stone, often covered with foam.
Access and hiking routes
The main starting point for exploring Mount Ontake is the station of Kiso-Fukushima, accessible by train from Nagano via the line JR Shinano. From the station, a bus service connects visitors to two access points:
- Tanohara, where a classic hiking trail starts
- The Ontake cable car, which allows to reach the heights quickly
The cable car climbs up to 2,150 metres, considerably reducing the walking time required to reach volcanic lakes and peaks.
The path from Otaki
From the remote village of Otaki, an ancient pilgrimage path leads walkers through a dense forest punctuated with waterfalls, shrines and places of recollection. Two waterfalls,KiyotakiandShintakiare still used for purification rites. We practice themisogi, an icy water immersion that aims to purify the body and mind.
A loop path of about 1h30 allows you to discover these waterfalls in a unique spiritual and natural setting.
High altitude lakes
Mount Ontake is home to several volcanic lakes, five of which were identified by geologist Tanaka Akamaro in 1927. The most famous,Neither Ike, is the highest mountain lake in Japan with 2,905 meters of altitude. Accessible on foot from the peaks, it is lined with a small refuge open during the summer season.
Access to the lake offers a spectacular panorama of volcanic rock formations, ash fields and active fumoils. In clear weather, the Japanese North Alps are sometimes seen.
Ascent tips
The ascent of Mount Ontake requires good preparation. The summit can be reached in five to six hours of walking from the cable car stations or traditional entry points. It is advisable to leave early, provide clothing against cold and rain, and check volcanic alerts before departure.
During the pilgrimage season (July-August), some sections can be very frequented, but outside these periods, silence reigns on the heights.
Mountain accommodation is rare. There are some shelters and hostels (ryokan) in the starting villages such as Otaki or Kaida, but it is best to book in advance.
In winter: a ski-friendly mountain
Mount Ontake is not only a summer destination. In winter, its snowy slopes welcome ski enthusiasts. Two small stations are open:
- Ontake Skijoin the village of Otaki
- Kaida Kogen Maia, on the north slope
These areas remain modest but offer an original experience: skiing on an active volcano, in a region with little tourism.
Security and vigilance
Since the eruption of 2014, access to the crater has been prohibited within one kilometre. The Japanese authorities maintain constant monitoring of the volcano, and information is regularly updated at prefectures and local stations.
It is recommended to consult the map of restricted areas and never leave marked trails. Most shelters and tourist offices provide useful advice and safety bulletins.
Mount Ontake is much more than just a volcano. It embodies a living mountain imbued with spirituality, memory and natural power. Whether you’re coming for hiking, pilgrimage or skiing, this mountain offers a rare immersion in deep Japan, far from classic routes.
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