Best natural monuments around Fontenais include diverse landscapes characterized by rivers, lakes, and unique geological formations. The region offers opportunities to explore well-preserved natural environments. These areas provide insights into the local geography and historical interactions with nature. Visitors can find various natural features suitable for outdoor exploration.
Last updated: June 26, 2026
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Depending on the water level, the lower entrance of the cave can be explored more or less dry.
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Impressive grotto under Millandre The active, vadose cave has been scientifically well studied. It is located in subhorizontal, fossil-bearing limestone. The cave river Milandrine flows through it, has a measured length of 10,520 meters and a vertical extension of 135 meters. https://de.wikipedia.org/wiki/Grotte_de_Milandre
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The Source du Doubs is a powerful karst spring in a heavily karstified area of the Jura Mountains. It is located near Mouthe, in the Haut-Jura Regional Nature Park, at an altitude of 937 m at the foot of the wooded, up to 1419 m high Mont Risoux mountain range, which marks the border between France and Switzerland. The Doubs rises from a cave in the rock from a small, approximately five-meter-deep spring basin. The spring discharges an average of 1740 litres per second and is the exit of a complex cave system with several siphons. The discharge can vary greatly. Several layers of rock can be distinguished on the rock above the spring. Below the spring, the river plunges down over a small waterfall. About two kilometers below the Source du Doubs, the approximately nine-kilometer-long Cébriot flows into the Doubs.
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A lovely rest area by a pond (Etang). It's truly one of the highlights of the tour.
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Beautiful pond! Very nice for hiking!
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Very pretty in the sunlight with the reflections. It should be avoided in foggy conditions.
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Very nice place, bucolic and quiet.
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If you stop in Porrentruy, if you are a herb, plant and flower enthusiast, you should definitely pay a visit to the Parc du Jardin Botanique. After the botanical garden in Basel, it is the second oldest in Switzerland. It is striking that in addition to the almost inexhaustible variety of plants, one or the other sundial on several house fronts shows the time in a shadowy way. A particularly idiosyncratic and modern example can be seen at the end of the park when you enter the area through the main portal. Right next to the botanical garden, there is a public car park that is subject to a fee. From the botanical garden, you can continue your journey of discovery in the direction of the old town, or pay your respects to the castle above the city.
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The most popular natural monuments in the Fontenais area include the Doubs river, known for its impressive 27-meter high Saut du Doubs waterfall. Visitors also highly appreciate Étang de Bollement, a tranquil lake and nature reserve, and the serene Doue Spring, located behind an old mill.
Yes, several natural monuments around Fontenais are suitable for families. The Doubs river offers a small beach area, perfect for a relaxing day. The Étang de Bollement is a beautiful lake with forest and meadow surroundings, ideal for a family outing. Additionally, the Dinosaur Tracks of Pommerat provide an exciting and educational experience, complete with a dinosaur children can ride.
Fontenais is home to fascinating geological sites. The Dinosaur Tracks of Pommerat showcase well-preserved 150-million-year-old fossilized footprints, protected under a tent roof. The region also features diverse landscapes characterized by rivers, lakes, and unique formations like the 27-meter high Saut du Doubs waterfall on the Doubs river.
Absolutely. The Porrentruy Botanical Garden, one of Switzerland's oldest, dates back to 1798 and is now part of the Nature Museum, offering a blend of historical horticulture and natural beauty. The Dinosaur Tracks of Pommerat are a significant archaeological and historical site, revealing ancient life forms. The Doue Spring is located behind an old mill, hinting at the region's industrial past.
The Fontenais area offers a variety of outdoor activities. You can find numerous road cycling routes, gravel biking trails, and running paths. For instance, explore the Doubs Valley on a gravel bike or enjoy a moderate running loop from Porrentruy. You can find more details on specific routes in the Road Cycling Routes around Fontenais, Gravel biking around Fontenais, and Running Trails around Fontenais guides.
The Dinosaur Tracks of Pommerat are freely accessible from April to October. This period ensures the best conditions for viewing the well-preserved tracks and enjoying the informative boards along the 'Sentier didactique'.
The Doubs river is unique for several reasons. It forms part of the French-Swiss border, notably featuring the spectacular 27-meter high Saut du Doubs waterfall. Historically, treaties dictate that the river entirely belongs to France along this border section. Visitors often describe it as 'little Switzerland' due to its picturesque landscapes, and it even boasts a small beach under trees.
Yes, for tranquility, the Doue Spring is highly recommended. It's described as a place where 'tranquility reigns supreme' and offers a haven of freshness during hot summers. The Étang de Bollement, a beautifully situated lake surrounded by forest and meadow, also provides a wonderfully idyllic and peaceful setting.
The Porrentruy Botanical Garden is home to over 600 local plant species from the Jura chain. It features a significant collection of more than 70 varieties of roses and 180 varieties of irises, which create a vibrant display of color when in bloom. The garden also showcases diverse plant species from around the world.
Visitors particularly enjoy the diverse and well-preserved natural environments. The impressive waterfalls like the Saut du Doubs, the serene lakes such as Étang de Bollement, and unique historical geological sites like the Dinosaur Tracks of Pommerat are highly appreciated. The blend of natural beauty with opportunities for outdoor activities and historical insights makes the region appealing.
Yes, the Étang de Bollement is noted as a beautiful viewpoint, offering scenic vistas of the lake surrounded by forest and meadow. The Doue Spring, a waterfall, also provides a picturesque setting for observation and relaxation.


Extend your search for the best caves by checking out these guides of the top ones around Fontenais: