For its fourth year, the intense ultra-trail running endurance race The North Face Endurance Challenge Costa Rica returns to the Rincón de la Vieja Volcano in Guanacaste, Costa Rica.
On Saturday, May 28, 2016, hundreds of runners from all over the world will challenge themselves and each other in four endurance trail-running races of 10 km, 21 km, 50 km and 80 km on the slopes of Rincón de la Vieja Volcano. All races are individual, with no teams.
Demanding trails cover difficult yet beautiful ter
