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The 12th OSJ Koumi 100 is a 100-mile trail race in Koumi, Nagano, Japan. The course consists of a 32km loop run multiple times, with a 36-hour time limit. Limited to 300 participants. Also features a relay category.
32km loop repeated 5 times
Trail race in the Nagano mountains
Start / Finish
Matsubara Lake Highland Skating Center, Koumi, Nagano
Matsubara Lake Highland Skating Center, Koumi, Nagano
Terrain
Route
Race Day
What you get
On the day
Toilets
Bag drop
Before you enter
Other questions
The course is a 32 km loop run 5 times on trails in the mountains of Koumi.
The event is limited to 300 participants.
No, the race does not have an IAU label.
Yes, there is a relay category for teams of 2-5 members covering the same 5-lap course.
Yes, for the individual category, a pacer is allowed for laps 4 and 5. Additional fee applies if adding later.
Entry fee
Registration isn't open yet. We'll show pricing when the organiser confirms.Koumi, Japan
Expected October 2027
Provisional date, around Oct 10More races like this one
Not open yet
