SwimTrek Milos Explorer Long Swims 2026

The Aegean Sea around the Milos archipelago offers a high-volume swimming itinerary, with daily distances averaging 8km, divided into morning and afternoon sessions of approximately 4km each. This seven-day program, starting on May 30, 2026, utilizes Pollonia as a base for daily boat-supported excursions. Wetsuits are optional, allowing swimmers to adapt to the water temperature as they navigate the volcanic topography that defines this section of the South Aegean. For those pursuing a more condensed challenge, UltraSwim 33.3 Milos takes place just one day earlier, on May 29, 2026, offering a different pacing for those in the area.

Geological landmarks under the surface

Swimming here means traversing the interior of a massive volcanic crater; the basin depth shifts dramatically from 130 to 55 meters, creating a distinct, sheltered environment for long-distance efforts. Beyond the main bay, the route incorporates the Glaronisia islets, where swimmers pass vertical andesite columns formed by lava flows nearly 800,000 years ago. These geometric rock formations provide a stark contrast to the bone-white volcanic cliffs of Sarakiniko, a site riddled with sea caves historically used by Saracen pirates to ambush passing vessels.

Navigational markers during the swims include the 'syrmata' houses in Klima, traditional two-story dwellings carved directly into the rock face where ground floors once protected fishing boats from winter swells. The coastline also holds traces of the Bronze Age settlement of Phylakopi, where portions of the ancient city wall now sit submerged beneath the surface. In the deeper, more secluded coastal cavities of Kleftiko, swimmers may encounter the Mediterranean monk seal, an elusive resident that has long utilized these volcanic grottoes for breeding. The logistics of the trip, including the constant presence of safety escorts and support vessels, are designed to manage the unpredictable conditions of these open channels, ensuring that the primary focus remains on the physical challenge of the 4000m segments.