Bodensee Umrundung (Germany, Switzerland, Austria)
Die Bodensee Umrundung umläuft den gesamten Bodensee inklusive Untersee und Überlinger See.
While the Bodensee-Radweg is one of the most popular bicycle routes in Europe, this FKT is a "free course" finding the shortest/fastest route to circumnavigate the lake on foot. It is often, but not always, on the bike path. Approx. 200km.