Middle mountain walk at the foot of the Gresson Ridge and the Haute Bers, the two Neuweiher glacial lakes are located on the same fault line as Alfeld Lake. Perches Lake (Strensee in Alsatian) nestles in an ancient glacial cirque at an altitude of 1,000 m and is one hour from the Neuweiher.
On the route: Crow Rock, inn and farm-inn.