A true alpine full-distance: cold lake swim, serious climbing and postcard Bernese Oberland scenery.
Clear, cold alpine swim in Lake Thun beneath the Bernese Oberland peaks.
Genuinely mountainous loops climbing above the lake with long sustained ascents and technical alpine descents.
Rolling run along the Aare river and through Thun's old town, with a short climb each lap.
Actual monthly averages from the last 3 years (Open-Meteo). Real race day may vary.
Water temp uses athlete-reported values first, then official race data, then the marine archive (sea swims, measured at the nearest offshore point). Values tagged est. are modelled from recent air temperature for lakes and rivers, where no observational data exists.
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