UltraSwim 33.3 Greece

UltraSwim 33.3 Greece (#15) is the “Mamma Mia” edition on Skopelos, Greece’s greenest island in the Sporades. It’s an epic open-water challenge built around the iconic 33.3 km (English Channel distance) — but instead of one massive swim, the total is split across 4 days and ~6 staged swims, letting you recover, refuel, and go again while still earning the full 33.3 finisher experience.

You’ll swim along Skopelos’ wild, unspoilt coastline — mixing sheltered bays with more exposed sections where the north wind can turn conditions from glassy-calm to properly “adventure.” The route is designed to pass famous Mamma Mia! filming locations, including the dramatic clifftop church Agios Ioannis (often used as a memorable finish-line moment). At least one island-to-island crossing is planned, and an optional night swim may be offered if weather allows.

- Conditions & vibe

• Warmest water in the series: typically 22–26°C

• Statistically one of the windiest venues, but also the most tropical-feeling

• Crystal-clear Aegean water, secluded coves, and true “remote coastline” swimming