TRAIL Ultramarathon on forgotten trails of aboriginal hunters in the center of Taiwan – FORMOSA.

  • 104km Formosa Trail (Formosa 104) / 5700m D+ (ITRA-5 XL, UTMB® Index 100k)
  • 75km / 4100m D+ (ITRA-4 L, UTMB® Index 100k)
  • 40km / 2400m D+ (ITRA-2 S, UTMB® Index 50k)
  • 18km / 770m D+ (ITRA-1 XS, UTMB® Index 20k)
  • 10km / 400m D+ hiking

The UTMB® Index is calculated for each of the 4 UTMB® World Series race categories 20K, 50K, 100K and 100M.
A valid UTMB® Index is achieved by completing at least one UTMB® World Series Major, UTMB® World Series Event or UTMB® World Series Qualifier race in the relevant category within the last 24 months. Once a race category has been activated, all races from the past 36 months will be used to calculate the UTMB® Index.
Consult your UTMB® Index


22nd November 2024 – Expo / race pack
23rd November 2024 – RACE DAY
24th November 2024 – Celebration

The Western States®
100-Mile Endurance Run

2024 Formosa Ultra-Trail® 104km is Qualifying Race for Western States® 2026