Natural monuments around Boncourt are situated in the Swiss Jura, a region characterized by its rolling hills, forests, and unique geological features. The area offers a diverse natural landscape shaped by ancient geological processes and rich biodiversity. This municipality provides access to various natural attractions, including significant karst formations and historical paleontological sites. The region's natural environment supports a range of outdoor activities focused on discovery and appreciation of its distinct natural heritage.
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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A place where tranquility reigns supreme.
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The source of the Doue is located behind an old mill which once used dynamite from the water to grind the cereals of the region. During the hot summers, the place turns into a haven of freshness.
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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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Natural arch at the end of a Jura valley. The Sarrazin Bridge takes its name from the legend of Allima, well known in the country.
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Over 600 local plant species from the Jura chain from Lake Biel to the Chasseral are on display. One focal point is the more than 70 varieties of roses and 180 varieties of irises, which enchant the garden in a huge sea of color when the flowers are in bloom.
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The region around Boncourt offers a variety of natural features. You can discover the refreshing Doue Spring, a waterfall located behind an old mill. Another highlight is the Pont Sarrazin Natural Arch, an impressive geological formation with local folklore. For plant enthusiasts, the Porrentruy Botanical Garden showcases diverse species and is one of Switzerland's oldest botanical gardens.
Yes, the area boasts significant geological formations. The Pont Sarrazin Natural Arch is a notable example, formed at the end of a Jura valley. Additionally, the Milandre Caves represent one of Switzerland's longest karst cave systems, though access is primarily restricted to speleologists. You can also visit the Dinosaur Tracks of Pommerat, where 150-million-year-old fossilized footprints are preserved.
Several natural monuments are family-friendly. The Dinosaur Tracks of Pommerat are a great option, featuring well-preserved footprints and even a dinosaur replica for children to ride. The Porrentruy Botanical Garden offers a beautiful and educational experience with its diverse plant collections. The Sentier des Faînes (Beechnut Trail) near Boncourt is also ideal for families, with chainsaw sculptures, picnic areas, and an 'Enchanted Forest' section.
The region offers various hiking opportunities. The Sentier des Faînes (Beechnut Trail) near Boncourt provides peaceful, well-maintained loops of around 2.6 km and 4.6 km, suitable for all ages. For more extensive adventures, you can explore the many routes available for cycling and mountain biking. For instance, there are numerous MTB trails around Boncourt, including routes that pass by the Old mill on the Allaine river or the Mont Renaud Observation Tower.
Yes, the Sentier des Faînes (Beechnut Trail) near Boncourt is particularly well-suited for all fitness levels. It features gentle gradients and two accessible loops (approximately 2.6 km and 4.6 km), making it perfect for a leisurely walk or a family outing. The trail is mostly shaded, providing a pleasant experience even during warmer months.
Beyond exploring the natural monuments themselves, the area around Boncourt is excellent for outdoor activities. You can find numerous routes for cycling, including circuits that pass through Switzerland, or enjoy gravel biking with routes like the Porrentruy Castle loop. Mountain biking is also popular, with MTB trails ranging from moderate to difficult, offering diverse terrain.
The region has significant historical and paleontological sites. The Dinosaur Tracks of Pommerat are a prime example, showcasing 150-million-year-old fossilized dinosaur footprints. The Porrentruy Botanical Garden, established in 1798, also holds historical significance as one of Switzerland's oldest botanical gardens.
The natural monuments around Boncourt can be enjoyed throughout the year, but the warmer months are particularly pleasant for outdoor activities. The Sentier des Faînes, for example, is mostly shaded, making it comfortable even in summer. The Dinosaur Tracks of Pommerat are freely accessible from April to October. During spring and summer, the Porrentruy Botanical Garden is especially vibrant with its blooming roses and irises.
Yes, the Doue Spring is a beautiful waterfall that provides a refreshing environment, especially during warmer months. It is situated behind an old mill, adding a touch of historical charm to the natural setting. The Milandre Caves also feature an underground river, the Milandrine, which has carved out its extensive system.
Visitors appreciate the diverse natural beauty and the tranquility of the region. Highlights like the Doue Spring are praised for their refreshing atmosphere and peacefulness. The Porrentruy Botanical Garden is loved for its extensive plant varieties and historical significance. The blend of natural wonders with artistic and educational elements, such as those found on the Sentier des Faînes, also provides a unique and enjoyable experience.
Yes, the Sentier des Faînes (Beechnut Trail) near Boncourt is well-equipped with amenities for visitors. It features dedicated picnic areas, a forest hut, and observation points, including a panoramic tower that offers splendid views of the surrounding landscape. These additions enhance the visitor experience, making it comfortable and engaging.
While some sites are well-known, the region holds hidden gems. The Milandre Caves, though not publicly accessible for casual visits, are a natural monument of immense scientific interest and geological significance, steeped in local folklore. The Sentier des Faînes, with its unique 'agrisculptures' and insect hotels, offers a charming and less conventional nature experience.


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