UltraSwim 33.3 Switzerland 2026 — Lac Léman

The current pushes against your stroke as you navigate the narrow passage where the Rhône river exits the basin of Lac Léman. Below you, the water transitions from the deep, still expanse of the lake into the swifter flow of the river, a shift you feel physically in the changing pressure against your body. As you sight forward, the Île Rousseau emerges, a small park sitting mid-stream with its statue of the philosopher standing watch over the confluence. Swimming toward the right bank, the silhouette of the Temple de Saint-Gervais rises above the water line, its foundations resting on 5th-century burial grounds, a reminder of the settlements that have occupied these banks for centuries.

Navigating the Geneva Waterfront

Your path takes you under the Pont de la Machine, a 19th-century structure that serves as a rigid threshold between the lake and the city’s heart. Further along, the span of the Pont de la Coulouvrenière looms, marking the connection between the busy rail hubs and the historic districts. The atmosphere here is marked by the scale of the infrastructure and the cold, glacial origins of the water. While the city landscape is dense, the presence of the water remains the primary focus of the UltraSwim 33.3 Switzerland. The event spans 33.3 kilometers over four days, broken into six stages to accommodate the distance.

Race Logistics and Conditions

Expect temperatures between 22-25°C in late July. The itinerary includes a 13-kilometer crossing from Lausanne to Evian, weather permitting, which requires close coordination with local maritime traffic. The logistics are designed around the use of public transport and the CGN ferry network, reflecting the regional infrastructure. Entry costs are set in Swiss Francs, reflecting the local operational requirements and the coordination of safety support across international borders. Beyond the physical challenge, the organization directs a portion of the entry fee to Leman Hope, a charity supporting young cancer survivors, fostering a connection between the endurance community and local social initiatives. The event structure prioritizes the logistical flow of swimmers through this alpine environment, utilizing the natural corridors created by the lake and river system.