ONE SWIM. ONE SEA. THREE COUNTRIES.

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Do you have what it takes to conquer the ultimate ultra-marathon challenge? The Triple Triumph of Trieste is calling.

 

Swim 21 kilometres in a single day along the breathtaking Adriatic coastline—starting in Croatia, through Slovenia, and finishing triumphantly in Italy. Every stroke will test your endurance, every tide will push your limits, and every kilometre will bring you closer to a once-in-a-lifetime achievement.

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This is not a casual swim. It’s a journey for elite ultra-marathon swimmers ready to push boundaries, challenge the elements, and prove their mettle in open water. Crystal-clear waters, stunning coastlines, and the thrill of completing a swim across three countries in one day—this is your ultimate test.

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The event takes place on 10 October 2026, and registration opens 2 February 2026. Spots are extremely limited, and participation is invitation-only, based on your ultra-marathon swimming experience and readiness to take on this extraordinary challenge. Solo swims, dual solos, and relay options are available, but safety and skill are paramount.

Start training. Prepare your support. Mark your calendar. The tide is waiting, and only those ready to rise to the challenge will answer its call. This is your chance to etch your name into the history of endurance swimming.