Arc Of Attrition by UTMB®

The Arc Of Attrition by UTMB® is held from 22 to 24 January 2027 from Porthtowan, along the Cornish coast in England. The flagship race, the Arc 100M (173 km, 5,507 m of elevation gain), forms part of the UTMB circuits and starts on 22 January.

It is followed by the Arc 100K (82.7 km, 2,708 m) on 23 January, then the Arc 50K (49.4 km, 1,458 m) and the Arc 20K (22.1 km, 744 m) on 24 January.

The route follows dramatic cliffs and the coastline, with open views of the ocean throughout. Run largely at night and in the depths of winter, the long format is demanding both physically and logistically, in true British coastal ultra style.