Marathon River Swim Series

The riverbed shifts beneath you as the current narrows, pulling with a steady, relentless force that dictates your rhythm. You are navigating a channel where the water density changes abruptly, forcing a stroke adjustment to maintain momentum against the push of the flow. This is the heart of the Marathon River Swim Series, a circuit designed to push endurance athletes through the varied hydraulics of three distinct European waterways.

The challenge across Europe

Each stage of the series demands a different strategy. The 11km GlommaDyppen in Lillestrøm, Norway, invites you into a raw, natural river environment where the water temperature and clarity reflect the mountain runoff. In contrast, the 31km UltraEbre in Spain’s Terres de l'Ebre region tests your ability to sustain pace over a long, single-track course that has challenged swimmers since 2012. The series also includes the 33km Le Flow des Gabarriers in Cognac, France, which requires careful navigation of the river’s winding sections and variable depths.

Technical logistics and series goals

To be recognized as a Marathon River Man or Woman, you must complete all three events within a five-year window. The series was established in 2022 to provide a structured goal for long-distance river swimmers, with all finishers automatically tracked. Registration fees and logistics for each stage cover the necessary safety measures, including kayak support and the management of river traffic, which are essential given the distances involved. Whether you are aiming for a specific finish time or completing the circuit for personal achievement, the series relies on your preparation for the specific hydraulic conditions of each river, from the deep, slow-moving stretches to the sections where the current accelerates.