Welcome to the Ultraswimrun family - Welcome to our world


An ultra-marathon, a.k.a ultra-race, is officially categorised into 50 km or +100 km by the International Association of Ultrarunners (IAU). An ultra-swim, a.k.a marathon or long-distance swim, is officially recognised by the International Olympic Committee (IOC) to be 10 km. The International Association of Athletics Federations (IAAF) recognises the official world record ultradistance to over 100 km.


In swimrun there is no general agreement for what can be considered as an ultra. We, the origin and founders of ultraswimrun, recognises any swimrun race that contain the tree above thresholds, as a true ultraswimrun race. That is, any race with a minimum of 50 km running, 10 km swim and a total lenght of 100 km is considered a true ultraswimrun in agreement with IAAF. A +75 km swimrun race including a miminum of 50 km running and 10 km swim, is considered as a short yet not official ultraswimrun .


Below you will find all available ultraswimrun races in the world

Stockholm Archipelago UltraSwimrun Challenge (SAUC)


Challenge yourself to the most amazing swimrun challenge there is. Conquer the classical route Arholma - Landsort, by swimrunning from the northernmost lighthouse at Arholma, to the most southernly at Landsort in the archipelago were swimrun was born.


You will experience the entire Stockholm archipelago, while working your way through circa 70 islands and 250 km of off-trail running and open water swimming.

Quick stats

Total approximate

distance (m)



Swim ratio

Number of transitions


Average temperature

255 000

190 000

65 000

34 %



Air: 18°C

Water: 15°C