Bodensee Längsquerung 2026

The Längsquerung is an ultra-endurance open water challenge covering a distance between 64 and 68 kilometers, connecting Bodman in Germany to Bregenz in Austria. Swimmers navigate the length of Lake Überlingen and the main basin of Lake Constance, an alpine rift valley shaped by the retreat of the Rhine Glacier during the Würm ice age. The route follows a corridor defined by steep molasse sandstone walls that plunge rapidly into the basin, where the lake reaches depths of 147 meters. Participants must account for shifting currents and thermal stratification; while surface temperatures fluctuate with the summer season, the deeper water remains frigid, and the banks drop off abruptly to 60 meters just meters from the shoreline.

Historical currents and navigation

The geography of this crossing is inseparable from its history. The name 'Bodensee' originates from the village of Bodman, where a 9th-century Carolingian royal palace once stood, serving as the namesake for the entire body of water. During the swim, athletes pass areas rich in human history, including the Bodman-Schachen site, which features prehistoric pile dwellings from the Stone and Bronze Ages protected as UNESCO World Heritage. Near the coast of Ludwigshafen, the remains of a 'Lädine' sailing vessel lie submerged at 22 meters, serving as a silent landmark for those navigating these waters. The site also holds somber historical significance; in 759 AD, the palace at Bodman functioned as a place of detention for Saint Othmar.

Logistics for this event are demanding, requiring strict adherence to the Bodenseequerung regulations. There is no physical contact allowed with the support boat or crew, and all nutrition must be consumed in the water. For those seeking shorter objectives in the same basin, the region offers the Wallhausen-Überlingen crossing in late August or the Meersburg to Konstanz route held in June. Whether swimming North-South or South-North, the challenge is an exercise in managing changing wind patterns and the physical toll of a continuous, day-long effort across one of Europe’s most significant lake systems.