The “Étang de la Gruère” is a dammed, but natural moor lake situated in a hollow on the highland plateau of the Franches-Montagnes in the canton of Jura.
The combination of intensively used meadows, upland and lowland moors provides the habitat for vast numbers of species of plants and animals.
A themed moorland walk above Zweisimmen tells walkers about the origins of moors and how to protect them. The path passes through "moorland scenery of particular beauty and national importance", which is under special protection.
If you hike the Amden mountain trail, via a road section leading to Hintere Höhi you will reach protected moorland: a marshy natural landscape of national importance covered with mountain pine.