New compact format
NEW 16.65 COMPACT FORMAT
#17BARCELONA [Costa Brava] - The 'Hidden Coves' Edition
Swimmers in warm open water at an UltraSwim 33.3 event in Greece

Swimming for a cause: fundraise by swimming the English Channel distance with UltraSwim 33.3

Swim the iconic English Channel distance of 33.3km across four days in warm open water, and turn it into something bigger than yourself. UltraSwim 33.3 gives fundraisers a goal people want to back. This is not for everyone, but everyone can do it.

Award winning, all inclusive packages from €1,800

Reef restoration with the Dalmatian Islands Environment Foundation

Dalmatian islands environment foundation

For our Croatia edition, we partnered with the Dalmatian Islands Environment Foundation who works to protect the ecosystems and diversity of the Dalmatian coast through raising funds, supporting projects and building a strong community to protect wildlife and local communities.

Dalmatian Islands Environment Foundation

léman hope

Since 2019, Léman hope has been using sailing as a therapeutic tool to help children in remission from cancer regain self-confidence, during a 5-day, 4-night cruise on Lake Geneva. This experience, a true bridge between treatment and an active future, embodies values of courage, sharing and hope. Léman hope aims to support these young people in their reconstruction after cancer, by offering them a caring environment where they can rediscover themselves and leave with optimism. The magic works, and each young person comes out of this human adventure with newfound growth and resilience.

UltraSwim 33.3 organisers and swimmers have already raised nearly 20,000 Swiss Francs (21k Euros) from the events held, with an objective of (of course) 33,333 Swiss Francs in 2027/8! See the donation page here.

Léman hope
UltraSwim 33.3 #14 Switzerland, Léman hope fundraiser
UltraSwim 33.3 #17 Barcelona, Cami de Ronda coastal path on the Costa Brava

save the med

Save the Med is a foundation set up to help the regeneration of the Mediterranean basin. We have partnered with them for our 16.65km COMPACT format to be held in S'agaro, north of Barcelona on the Costa Brava.

Save the Med

Give it meaning

Our goal is to build purpose through our events, that's why we want to partner with a charity for each of our locations. if you have any ideas then contact us on purpose@ultraswim333.com

Swimming for a cause

Every event, swimmers take on UltraSwim 33.3 to raise money and awareness for causes they care about. Here is how to make your swim count. These are the questions fundraisers ask us most.

Can I swim to raise money for charity?+

Absolutely. Many of our swimmers fundraise, for national charities and local causes alike. The 33.3km Channel distance gives supporters a vivid goal to get behind, and your 17 week training plan keeps them engaged and giving all the way to the start line.

Which charities can I fundraise for?+

Any registered charity or cause you choose, national or local. There is no set partner, the swim is yours to dedicate however matters most to you.

Will you help me share my story?+

Yes. We support fundraisers with event photography, daily milestones and shareable content, so your supporters can follow your progress from training through to the finish.

How much does an UltraSwim 33.3 event cost?+

All inclusive packages start from €1,800 and cover accommodation, world class safety, support and the full four day swim. A €500 deposit secures your place and is fully refundable within 30 days. Exact pricing is shown on each event page.

Reserve your place today

Nothing great is easy. Choose your event and secure your spot with a fully refundable €500 deposit. Your adventure of a lifetime starts here.

Book Now

Stay Informed

If you're interested, but can't commit to a challenge right now, subscribe to our newsletter and receive an edition of Flow magazine, UltraSwim 33.3's ultimate guide to open water endurance swimming.

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Swim for something bigger

Nothing great is easy. Choose your event, secure your place with a fully refundable deposit, and start raising for the cause that matters to you.

Choose your event