OSJ安達太良山トレイル takes place on Sun, Sep 6, 2026 in Nihonmatsu, Japan. The main route is 50 km.
- Date
- Sun, Sep 6, 2026
- Start
- Nihonmatsu 🇯🇵
- Distance
- 50 km
- Level
- Open to all
Set against the stunning volcanic terrain of Mt. Adatara, one of Japan's 100 famous mountains, the course offers varied trail layouts and finishes with relaxing hot springs in Dake Onsen.
Official event pageWhat this race demands
OSJ安達太良山トレイル is a 50-kilometer trail running event held on the volcanic terrain of Mt. Adatara in September, requiring sustained endurance across varied mountain trails.
Distance endurance
Covering 50 kilometers on foot requires robust aerobic endurance and pacing discipline to manage muscular fatigue over many hours of continuous movement.
Terrain management
Navigating the varied trail layouts of a volcanic mountain environment demands technical footwork, ankle stability, and sustained focus on uneven surfaces.
A 50-kilometer trail race will take most runners well over 2.5 hours, so athletes should aim for a consistent carbohydrate intake of 60 to 90 grams per hour to sustain output and prevent late-race depletion.
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