Bodensee Openwater — Friedrichshafen-Romanshorn

Beneath you, the water depth drops sharply as you leave the bustling harbor of Friedrichshafen, transitioning from the shallow, sun-dappled zone where the Rotach river deposits its sediments into the lake. As you find your rhythm, you are effectively swimming over a submerged industrial history; during the Second World War, this city was a primary target due to its critical factories, and the lake bed still hides artifacts of the era when the sky was dominated by giant airships. Ferdinand von Zeppelin once perfected the launch of his rigid dirigibles here, utilizing a clever floating hangar that pivoted with the wind. The scale of this engineering is hard to grasp until you consider that the ill-fated LZ 129 Hindenburg—the largest airship ever built—first rose from these very waters.

Crossing the Swabian Sea

This 11-kilometer stretch is the longest organized open water swim on Lake Constance, requiring you to navigate the international expanse between Germany and Switzerland. As you press toward the distant Swiss shore, you might recall that this region was once a patchwork of five different time zones, a 19th-century administrative curiosity that made harbor schedules a logistical nightmare for travelers. While you focus on your stroke, keep in mind the regional tradition of the 'Swabian Sea,' a hyperbolic nickname that underscores the sheer vastness you are currently navigating. If you find the length of this crossing invigorating, those seeking a shorter, high-intensity test often look to the Bodensee Breitenquerung in mid-July.

Race day logistics

The Bodensee Openwater Friedrichshafen-Romanshorn is held annually, with the next edition scheduled for August 1, 2026. The route takes you across the widest part of the lake, far from the Neolithic pile dwellings that line the protected shallows of the shore, such as the reconstructed site at Unteruhldingen. The event is defined by professional water safety protocols, ensuring that the alpine-induced winds—known locally as foehn—and the potential for sudden, sharp temperature shifts do not compromise the challenge. You will occasionally see the remnants of the old border between Baden and Württemberg near the shorelines, a silent witness to the region's complex history. Whether you are aiming for a personal best or simply completing the crossing, the experience of navigating these historic waters is the true core of the event, supported by a local hosting culture that has catered to summer residents and travelers for over a century.