Mt Ontake
NAGANO MOUNTAINS
Elevation
Difficulty
Time
3,067 m
Nagano and
Gifu prefectures
7-8 hours
Tanohara trailhead
Kurosawa trailhead
Spectacular volcanic moonscape with a sad history
Mt Ontake (Japanese: 御嶽山) rises above the Kiso region as one of Japan’s most sacred and storied mountains, a hyakumeizan* with a vast summit area shaped by centuries of volcanic activity. Its upper reaches form a broad, varied plateau, stretching from the main peak of Kengamine (剣ヶ峰) to the rocky spire of Marishiten (摩利支天) and across a series of dramatic volcanic craters. Few mountains in Japan offer such an expansive summit landscape, where ridges, lava fields and old eruption scars blend into a single high‑altitude world.
There are several climbing routes, including approaches from the Kiso side, the Gifu side, and the popular trailheads near Otaki. In recent years I’ve preferred the quieter Kurosawa trailhead, where the number of hikers is generally smaller and the forest approach feels peaceful. The climb gradually rises through thick woodland before emerging into Ontake’s open volcanic terrain, where the air cools and the views widen.
Ontake is also known for its rich flora and fauna. Alpine flowers bloom across the slopes in summer, and raicho rock ptarmigans often appear among the stones near the summit, despite fears that they had all persihed in the eruption.
Ontake is remembered for tragedy. In 2014, a sudden phreatic eruption struck without warning, claiming many lives and reshaping how Japan monitors active volcanoes. Since then, access has been carefully managed, with periodic closures depending on volcanic activity levels. Each time the mountain closes, I find myself waiting impatiently for it to reopen. Ontake has become a yearly pilgrimage for me.
Climbing Ontake is never just a hike. It is a journey across a living volcano, a place where beauty, danger and spiritual history meet. From Kengamine’s broad summit to Marishiten’s rocky crown, the mountain offers a landscape unlike any other in Japan, and each visit feels both humbling and deeply rewarding.
* 100 famous mountains of Japan
(All information here is based on personal observations and experiences. Check official sources before planning or starting any hikes.)