TRAIL Ultramarathon on forgotten trails of aboriginal hunters in the center of Taiwan – FORMOSA.越野超級馬拉松即將在台灣中部已經被遺忘的原住民獵人獵徑-福爾摩沙古道 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 achie…