Ultra-trail

The Best (Ultra) Trail Races In Japan: Up To 160KM

What It Takes to Run a Mountain-Ultra-Trail Race

Hiking The Madeira Island Ultra Trail (MIUT): 115km In 4 Days

Vertical, trail or ultra? Trail running race charateristics

Ranking the Toughest Ultra-Marathon Races in the World

World Trail Majors, a New Global Trail Running Series, Announced – iRunFar

Bighorn Trail Run - Trail Running, Ultra Running

Best USA Ultra Marathons, Top 5 100 Mile Ultra Races in the US

Lavaredo Ultra Trail EN

9. Grossglockner Ultra-Trail

UltraSignup - Races, Registration and Results

Ultra-Trail Australia by UTMB