The Ultramarathon Swim Series
An initiative dedicated to the preservation of the world's most revered marathon races in a global swim series.The Ultramarathon Swim Series transcends borders, encompassing races from all corners of the world. We invite swimmers, both professional and amateur, from all nations to participate and celebrate the universal passion for long-distance swimming.
Choose Your Races
Trans Tahoe Solo
Traditionally done as a relay, WOWSA has partnered with the Olympic Club t
Traversée internationale du lac St-Jean
Each summer since 1955, the Traversée Internationale du lac St-Jean attra
Travessia Lisboa – Cascais
The Travessia Lisboa Cascais 20km Open water swimming race is a point-to-p
Maratona del Golfo Capri-Napoli
Maratona del Golfo Capri-Napoli is one of the longest running professional
ULTRAMARATHON SWIM SERIES
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Swim Challenge Cascais Launches 20 km to Join Ultramarathon Swim Series
The 11th edition of the Swim Challenge Cascais is introducing the Travessia
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The Capri-Napoli Marathon 70th Anniversary Celebration Showcases Global Talent
In the world of open water swimming, few events hold the prestige
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Italians Triumph at the 69th La Traversée internationale du lac Saint-Jean in Challenging Conditions
La Traversée internationale du lac Saint-Jean has always presented a formidable challenge
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69th La Traversée internationale du lac Saint-Jean Double World Champion, Axel Reymond, To Start
News from La Traversée internationale du lac Saint-Jean: For the first time ever,
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Portugal’s Travessia Lisboa Cascais Joins UltraMarathon Swim Series with 20km Course
Portugal will join the UltraMarathon Swim Series world circuit with the 20km
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Morgane Dornic, Edoardo Stochino Win Traversée Internationale du Lac St-Jean – UltraMarathon Swim Series
Morgane Dornic of France and Edoardo Stochino of Italy won the 32
