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UltraJapanNagano Prefecture

OSJ KOUMI1002026

11.10 – 12.10.2026Koumi Town (Japan)
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Pacing, fueling and crew sheet for the course you pick

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1 course · 168 km

1 course

  1. 168km

    7’916 m D+

    avg 5%

    100 Miles

    11.10.

    ITRA 6

GPX trace not yet published.

Race plan

Plan your race from start to finish.

Pacing, aid stations and fueling timed to your effort on OSJ KOUMI100, in one roadbook.

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The race

100-mile ultra trail race (approx. 165 km) on a 33 km loop to be completed 5 times around Lake Matsubara and Inakoyu in Koumi Town, Nagano Prefecture. The event offers individual and relay categories, with a self-aid system where runners manage their own supplies from their vehicle or tent.

Where to stay

Find a place to stay near Koumi Town for the race.

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