Etang de la Gruère

Etang de la Gruère is a small pond set in a raised peat bog at roughly 1,000 m above sea level, a short distance from Saignelégier in the Swiss canton of Jura. It lies on the Franches-Montagnes plateau, and together with the surrounding bog it forms a nature reserve of national importance and one of the most popular walks in the region.

What is Etang de la Gruère?

The pond is man-made, created within a natural high moor. Locals cut peat here for fuel for generations, and in the 17th century a dam was built across the marsh to hold water for a mill. The mill first ground grain and was later converted into a sawmill. Today the water is a few metres deep, and the reserve covers about one square kilometre, including the forest around it and two smaller ponds. The bog itself has been growing for around twelve thousand years, with peat several metres thick in places.

What will you see?

A trail of wooden boardwalks, footbridges and pontoons circles the water and keeps feet off the fragile vegetation. You pass dwarf pines, peat moss hummocks and dark, tea-coloured pools. The plants and animals include species typical of tundra, unusual at this altitude in central Europe. The bog turns rusty orange in autumn, and in winter the pond freezes, making the loop a quiet snowy walk.

How long is the walk and how do you get there?

The loop is about 2.8 km and takes 45 to 60 minutes. It is flat and easy, with no significant climbs, so it suits families with children. Take the bus to the Moulin de la Gruère stop or drive and use the nearby car park. The area is known for the Franches-Montagnes horse breed, so many visitors pair the pond with a stroll or ride across the neighbouring pastures and a stop in Saignelégier.

What are the rules?

Because of heavy visitor numbers and the delicate habitat, stay on the marked paths. Dogs must be on a lead. Fires, camping and drones are not allowed. The nearby Centre Nature Les Cerlatez runs educational activities and guided visits.

Frequently asked questions

Is there an entrance fee? No, the reserve and the trail are open to everyone.

How long does it take to walk around the pond? About an hour at a relaxed pace; the loop is under 3 km.

Can I bring a pushchair or a dog? Dogs are allowed on a lead only. The boardwalks are narrow, so a pushchair can be awkward, especially when it is busy.

When is the best time to visit? Early in the morning or on weekdays, when there are fewer people. The bog looks good in summer and autumn, and winter brings a calm walk among snow and ice.