You have the endurance of an Ironman. Point it at the water and take on 33.3km across four days.
Ironman builds a deep aerobic engine across three sports. UltraSwim 33.3 focuses all of it on one: 33.3km of open water across four days in warm water. For Ironman finishers who want a single sport challenge, it is a natural next goal.
UltraSwim 33.3 is an Epic Adventure Swim Race™ covering 33.3km, the historic English Channel distance, split across five to seven point to point open water swims (we hate laps) over four days in warmer water locations (a half Channel 17km option exists). So far held in Croatia, Switzerland, Greece, Spain, Montenegro and the Caribbean, based at luxury spa hotels, with world class safety cover, premium support, a complete preparation programme and a diverse community that ranges from 14 to 74 years old, usually more women than men. From competitive Masters swimmers, triathletes and swimrunners to leisure and wild swimmers simply aiming to complete the distance. From a required pace of just 2km/h, any determined swimmer can do it. Come in a group or alone, everyone leaves with new friends for life. Award winning, all inclusive packages start from €1,575 CHECK (€750 for our 2 day Compact format)
Ironman builds a deep aerobic engine across three sports. UltraSwim 33.3 focuses all of it on swimming: 33.3km over four days in warm water. No transitions, no bike, no run, just the purest test of endurance in the water.
The patience, pacing and aerobic base built in Ironman transfer directly to endurance swimming. With no bike or run and no transitions, UltraSwim 33.3 is the purest test of that endurance in the water, and many Ironman athletes find deep satisfaction in mastering one discipline.
The iconic English Channel distance spread over 5 - 7 swims. Choose the full 33.3 CLASSIC, or the 33.3 / 2 BUILD 'Half Channel' which caps each swim at 5km. Life-changing for many.
Swiss precision event organisation. Boat and kayak safety cover provided on every swim. Daily briefings on conditions, route and pace. Experienced and dedicated team
Whether you come on your own or with a club, you will find your tribe, and make new lifelong bonds over 4 days of highs and lows as you reach for that 33.3 Finisher droplet
All iconic, each with their own challenges and beauty - Croatia, Switzerland, Greece, Montenegro, Spain and the Caribbean. From May to December and designed to fit your season and time constraints.
Explore the preparation programme, coaching and swim camps that get you to the start line ready.
Explore trainingAfter years of juggling three sports, many Ironman finishers find joy in mastering one. The water rewards the patience and discipline they already have.
Ironman finishers describe why the single sport challenge drew them in.
It is far longer. An Ironman swim is 3.8km; UltraSwim 33.3 is 33.3km across four days. The endurance base from Ironman is an excellent starting point.
Yes, towards swim specific volume and open water skills. Your aerobic base carries over; the preparation programme guides the shift.
Ironman gives you a solid start. Sighting, pacing and long swim confidence are built further in the preparation programme.
All inclusive packages from 1,800 euro cover hotel, meals, swim support, transfers, the finisher dinner and a full preparation programme.