15h Yilan Dongshan River 100km Ultra-Marathon

34 days away

100 km Distance

not publishedn/a Climbing

5.0 est Grit · Challenging

Calculated from 100 km alone — the organiser has not published an elevation profile. Read 5.0 as a floor, not a verdict.

23.9145° N, 121.0441° E © OpenFreeMap © OpenMapTiles Data from OpenStreetMap

What the course asks

Time limit 15 hours 9:00 min/km average. Firm. Climbing is unpublished, so this pace is a ceiling on the effort, not a measure of it. About average for a 100K. Measured against 226 races of the same distance. Cut-off calculator →

Field size ~76 Mid-sized. Company early, well spread out by halfway.

DUV results for the 2025 edition (100km) — finishers only. Starters are not published, so the field was at least this big and no finish rate can be given.

Typical conditions, November

Daytime high 19°C

Night low 12°C

Rainfall Showers likely

Daylight 10 h 55 m of light

Regional 2001-2020 average for November — NASA POWER, grid elevation 1323 m. Not a forecast.

Results history

Year	Race	Finishers	Men's winner	Women's winner
2025	100km	76	Pin-Chi Chou · 08:16:08	Kuan-Ju Lin · 08:17:10
2024	100km	87	Jiun-Yu Tsai · 08:26:38	Ching-Wen Hsiao · 10:53:41
2023	100km	70	Jiun-Yu Tsai · 08:35:36	Ling-Chun Chou · 08:54:14
2022	100km	54	Ming-Feng Lee · 08:50:27	Chin-Tzu Huang · 14:29:31
2021	100km	57	Ming-Feng Lee · 09:06:13	Ya-Ping Chan · 11:20:19
2020	100km	45	Wen-Hsiung Kuo · 07:48:22	Shih-Ying Wei · 11:54:09
2019	100km	68	Yeh-Hua Kuo · 08:51:20	Yuki Nose · 09:54:20
2018	100km	85	Chung-Liang Chang · 09:00:53	Yi-Hua (Fanny) Wu · 09:41:37
2017	100km	77	Li-Chen Chou · 08:52:44	Ling-Chun Chou · 08:47:03
2016	100km	113	Yen-Ching Chiang · 08:08:56	Wen-Hsuan Hsiang · 10:00:30

The field shrank 13% between 2024 (87) and 2025 (76). 16% of the 2025 field were women.

DUV results for the 2025 edition (100km) — finishers only. Starters are not published, so the field was at least this big and no finish rate can be given.

Course notes

gear With trail terrain, choose a shoe with moderate cushioning for optimal performance.
nutrition For 100km+ efforts, prioritize real food at aid stations to prevent palate fatigue.

Gear for this race

Chosen for 100 km of trail.

Trail Running Shoes 100 km of trail — cushioning that is still there in the last quarter.
Race Nutrition Past 100 km the palate quits before the legs do — carry more than one flavour.
Hydration Vests Flask capacity for 100 km, without the bounce.
Headlamps A 15 h limit puts you out there after dark.
Accessories Chafe and blisters end more 100 km races than fitness does.

Adidas

Terrex Agravic Speed Ultra

RunRepeat found the Adidas Terrex Agravic Speed Ultra to be perfect for midfoot and forefoot strikers, while iRunFar noted that the shoe feels incredibly effici…

★★★★★ 4.5

Asics