Étang de la Gruère

Étang de la Gruère, nestled at nearly 1,000 meters above sea level between Saignelégier and Tramelan, is a unique natural jewel in the Swiss Jura. The lake and its surrounding peat bogs were formed in the 17th century when a stream was dammed to power a sawmill, creating a wetland habitat that has since become a haven for wildlife and a site of national ecological importance. Today, the area is protected as a nature reserve, preserving its delicate ecosystems and offering visitors a rare glimpse into the region’s natural heritage.

History and Heritage The creation of Étang de la Gruère was an unintended consequence of early industry, but over time, the lake and bogs became valued for their beauty and biodiversity. The reserve now covers over 120 hectares, with the peat bog itself extending across 56 hectares and containing layers of peat up to nine meters deep. The area is managed to maintain its natural character, with boardwalks and marked trails allowing visitors to explore without disturbing sensitive habitats.

Main Attractions The main attraction is the easy, well-maintained circular trail that loops around the lake, offering ever-changing views of the water, forests, and moorland. The walk takes about an hour and is suitable for all ages, making it a popular outing for families and casual hikers. Along the way, interpretive signs provide information about the flora, fauna, and history of the site. The lake is a favorite spot for picnics, and in summer, confident swimmers can enjoy a refreshing dip in its dark, peaty waters—though there are no lifeguards or shallow entry points.

The reserve is a paradise for nature lovers and photographers. Rare plants such as sundews and cotton grass thrive in the bog, while dragonflies, frogs, and a variety of birds can be spotted throughout the year. The peaceful setting and lack of crowds make Étang de la Gruère an ideal place for quiet reflection and wildlife observation.

Activities Walking and nature observation are the main activities at Étang de la Gruère. The circular trail is accessible year-round, with each season offering its own charms: wildflowers and birdsong in spring, lush greenery and swimming in summer, vibrant foliage in autumn, and a magical snowy landscape in winter. Guided tours are available through the local nature center, and the area is also popular for picnicking and gentle exploration.

Getting There Étang de la Gruère is easily accessible by car, with parking available near the trailhead at La Theurre. Public transport options include trains to Saignelégier, followed by a short bus or taxi ride. The reserve is well signposted, and the trails are clearly marked for visitors.

Seasonal Advice The best time to visit Étang de la Gruère is from late spring to early autumn, when the weather is mild and the trails are dry. Early morning or late evening visits offer the most peaceful experience and the best chance to see wildlife. Summer is ideal for swimming and picnics, while autumn brings beautiful colors to the forests and moor. Winter visits are possible, but trails may be icy or snow-covered—sturdy footwear is recommended. Regardless of the season, Étang de la Gruère’s tranquil beauty and natural diversity make it a must-see in the Jura.