The English Channel distance of 33.3km over four days in warm water.
All inclusive adventure swim packages from 1,800 euro.
Most swimmers arrive alone and leave with friends for life.
Hear what 33.3'ers say about the adventure of a lifetime.
Every event footprint measured, reduced and compensated through Sea Trees.
Questions about an event or a booking? Talk to the team.
Find your critical swim speed and pace your training.
Official Reviews Partner
Independent swimmer reviews and ratings
Awards and Reviews
Official Reviews Partner hosting independent, verified swimmer reviews and ratings of the event.
About
Racecheck is an independent review platform where UltraSwim 33.3 swimmers can read and share honest, verified reviews and ratings of the event.
