Skip to content
kliva
UltraJapanNagano Prefecture

OSJ KOUMI100 2026

11.10 – 12.10.2026Koumi Town, Nagano (Japan)
Build your race plan →

Pacing, fueling and crew sheet for the course you pick

RegisterOfficial siteWrong info?

7’91625’971 m D+ ft D+

165 km102.5 mi100 Miles

At a glance

OSJ KOUMI100 2026 took place from Sunday 11 to Monday 12 October 2026 in Koumi Town, Nagano (Nagano Prefecture, Japan). One distance: 165 km.

The course is 165 km with 7’916 m D+ (48 m per km: mountain terrain).

The 2027 edition is expected on Sunday 10 October 2027, date to be confirmed by the organiser. On Kliva, plan your pacing and nutrition for free, then send the plan to your watch.

A 100-mile race consisting of 5 laps of a 33km course around Matsubara Lake and Inako-yu in Koumi Town, Yatsugatake.
From the organiser

1 course

  1. 165km102.5mi

    7’916 m D+25’971 ft 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.

Build your race plan →

Start

Koumi Town, Nagano (Japan)

Skip the map

Where to stay

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

We may earn a commission if you book through this map, at no extra cost to you.

Spotted wrong info on this page? Tell us and we'll review it. Report it

← Back to calendar
Editions