Etang de la Gruère

CONSTRUCTION INFORMATION: From August 19, 2024, to spring 2025, a portion of the trail will be closed to the public due to construction work. However, it will still be possible to access the pond via the path from Petite Theurre and through the access from the sawmill, as the trail in the "northeast" area of the pond will remain accessible to visitors.

The Etang de la Gruère nature reserve covers more than 120 hectares. The peat bog or upland moor extends over 56 hectares and has a nine-metre layer of peat accumulated over 12,000 years (after the end of the ice age). Most of the reserve lies within the territory of the town of Saignelégier but some of it also extends into the territory of the Jura towns of Bémont and Montfaucon, as well as Tramelan in the canton of Bern. It is classified as a marshland of national importance. In the 17th century, an artificial dam was built to operate a mill.