Ultra Running Hub Tsunan, Niigata Pref., Japan · Sunday, July 5, 2026
Naeba-Sanroku Geopark Tsunan Ultramarathon 80K
What the course asks
DUV results for the 2026 edition (80km) — finishers only. Starters are not published, so the field was at least this big and no finish rate can be given.
Typical conditions, July
Regional 2001-2020 average for July — NASA POWER, grid elevation 784 m. Not a forecast.
Results history
| Year | Race | Finishers | Men's winner | Women's winner |
|---|---|---|---|---|
| 2026 | 80km | 51 | Kiyotaka Imai · 06:07:14 | Miho Nakata · 06:28:18 |
| 2025 | 80km | 32 | Kiyotaka Imai · 07:14:32 | Shinobu Tago · 08:34:20 |
The field grew 59% between 2025 (32) and 2026 (51). 24% of the 2026 field were women.
DUV results for the 2026 edition (80km) — finishers only. Starters are not published, so the field was at least this big and no finish rate can be given.
Course notes
- terrain This is a rolling course. Expect fast, runnable sections where rhythm is key.
- gear With road terrain, choose a shoe with moderate cushioning for optimal performance.
Gear for this race
Chosen for 80 km of road with 2,800 m of ascent.
- Trail Running Shoes 35 m of climb per kilometre — grip and rock protection before cushioning.
- Race Nutrition 80 km of self-supported fuelling between aid stations.
- Hydration Vests Pole attachment and chest-strap stability on steep ground.
- Trekking Poles 2,800 m of ascent to walk up.
- Headlamps A 15 h limit puts you out there after dark.
Overview
Organised by Sports Aid Japan, the Naeba-Sanroku Geopark Tsunan Ultramarathon 80K was a road race held in Tsunan, Niigata Pref., Japan. Despite being contested on asphalt, the 80 km route packed 2800 meters of elevation gain, forcing runners to manage an average of 35 meters of climb per kilometer over the July event.
The 15-hour time limit demanded a cut-off pace of 11.3 minutes per kilometer. That deadline made the cut-off more generous than 51% of 50mi peers and tighter than 49%, offering just enough cushion to hike the steepest grades without immediately falling behind schedule.
Across 2 editions since its debut in 2025, the race drew middle-of-the-pack attendance. The 2026 running saw 51 finishers, landing in an event bracket that had a bigger field than 51% of 50mi races and a smaller field than 48%.