Between 1908 and 1913, the Möhne dam was built in Günne. This created the Möhne Reservoir, whose main task is to provide water for the industrial area of the Ruhr. Lake Möhne is a European bird sanctuary.
A lake cruise in the catamaran of the Möhneseeschifffahrt (from Easter to October) is also worthwhile.
You could also visit the nearby Kleiberg pastureland nature reserve in Büecke.
Address for satnavs: Arnsberger Straße 4, 59519 Möhnesee
Google coordinates: 51.472040, 8.098525