The belvederes and the peat bog of Nanchez - Prénovel
The belvederes and the peat bog of Nanchez - Prénovel

The belvederes and the peat bog of Nanchez - Prénovel

Fauna – Flora
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A condensed Jura: forests, rocky promontories, flowered prairies, secret peat bogs and small rivers with a “thousand” meanders.

Throughout the seasons, this walk will lead you through the middle of freshly flowered prairies in the height of summer, through fields of snow in the winter with imprints of the wild fauna, and to the heart of the open spruce forests and the peat bog’s taiga landscape.
From the belvederes, open views open out over the combe and its winding rivers, whilst, to the east, the summits of the High-Jura outline the horizon.

12 points of interest

  • Viewpoint

    Belvedere of the Duchet

    Perched 971 m high-up on the Bois de la Joux anticline, this belvedere overlooks the Anchey Combe (or the Prénovel-Les-Piards combe). According to geologists, this combe is a real combe, dug into the mountain by erosion. The mildness of the slopes is the result of the glaciers having deposited moraines. This combe is now used for hay fields.

    The Nanchez forebay (or the Anchey forebay), which winds along the foot of the belvedere, has once more joined its meanderings since 2016, slowing flood flows and benefitting biodiversity and the rivers downstream.

    From the north to the south, you will see various hamlets: Prénovel de Bise, les Belbenoîts, les Janiers (with the church), Les Fans and Les Berrods. To the south, you should be able to make out the village of Les Piards, where the houses are much closer together.
  • Natural environments

    The Nanchez peat bog

    Peat bogs are characterised by a surface that is constantly water-logged, where peat forms and accumulates: it is a type of bedding made-up of dead vegetation which has badly decomposed due to the absence of oxygen. Life conditions are demanding in these environments and this means that the species that live here must adapt to the omnipresence of water, to a relatively cold climate and to the chemical composition of the soil.

  • Flora


    This small carnivorous plant traps insects using its sticky digestive-juice covered hair. This adjustment allows the plant to acquire additional nutrients in this environment where its roots struggle to find enough food.

  • Flora

    The bog bilberry

    This phony blueberry favours environments that are slightly acidic, which is why it can be found in raised bogs or bogs that are in the process of drying out. Its edible berries, which mature mid-summer, are not as sweet as blueberries.

  • Flora


    This plant’s roots produce toxic secretions which hinder the growth of other species. It is often called common heather.

  • Fauna

    The violet copper

    This butterfly is typical of northern regions. Adults can be seen flying around in May and at the beginning of June. Females lay their eggs by sliding backwards under the leaves of the common bistort. Caterpillars then complete their development on the underside of these leaves.

  • Flora


    Their silky tuft does not appear during the flowering stage but rather the fruit stage: the cotton-like fibres that make-up this tuft are carried by the wind to aid the dispersal of its seeds.

  • Flora

    Mountain pine

    In the Jura, these trees are found almost exclusively in peat bogs: its bushy silhouette, its short needles that grow in pairs of two and the hook on the leaves of its cones are some of its distinctive features that will help you to identify one.

  • Viewpoint

    Belvedere over the Fort

    Already on the map in 1835 under the name “La Roche du Fort”, this belvedere – cleared only a few years ago - opens onto the Anchey combe (Prénovel-Les-Piards), the Nanchez forebay and the peat bog. To the south-east you can see the High-Jura mountain range from the Dole to the Reculet.

    At the foot of the belvedere are several funnels, one of which is very visible near the road, and which create overflows during floods. When the sawmills downstream were in operation, the factory workers would try to block them in an attempt to keep enough water for their hydraulic wheels. Regardless of the flow rate, the forebay runs into the karst behind the hamlet of Chaux-des-Prés. Its springs up again 27 km further along, in the Bienne valley.
  • History & Heritage

    The crown of the low walls

    The capping on the low dry-stone walls, or crown, maintains and stabilises the sides (visible parts) of the wall. Without it, the stones, and particularly those at the top, would end up falling. Here, you can observe a technique in which large and relatively flat stones, called lauzes, are laid vertically and often stabilised by spacers in between.

  • History & Heritage

    Wood-turning workshops

    More than a place of work or a rudimentary shelter for craftsmen, for those who occupied it, the workshop is a setting that is both intimate and public.
    Between the tools used, on the worktops where sawdust is pushed away with the palm of a hand, is where craftsmen build their know-how, by the light shed by the large dusty windows.

  • History & Heritage

    The evolution of life and buildings

    The rural house was first the one belonging to the farmer and livestock breed, where men and animals lived together. As from the 18th century, cheese specialisation and the pooling of milk in cooperative structures - “fruitières” - brought farmers out of a self-subsistence economy. In terms of buildings, the farm became bigger: a storey is added to include bedrooms, a second stable is sometimes built to accommodate more animals.


Departing from PRENOVEL, take the road (yellow waymarking) around the holiday resort towards Champs de la Vie.  Cross the départementale road with care, and then head through the Champs de la Vie, to reach the Crest Bridge.

Follow the forest path to the left until you come to La Faicle. Climb up a steepish slope to the left until you reach the DUCHET BELVEDERE.

The trail heads back downhill to the right until it comes to the Duchet Forest. At the junction, the trail rapidly descends towards Sous Duchet.

Continue on the grassy path to the right, that overlooks and runs along the stream. Head past Le cotat Bossu and arrive at THE PEAT BOG. Down to your right, take the adapted trail to discover this particular natural environment.

At the Crossing of Forebays, continue on the path to your right, cross the stream and reach Le Pontet, at the départemental road. Cross the road with care, and follow it for 140 m before climbing a well-marked steep slope into the forest, punctuated by the BELVEDERE OVER THE FORT.

Make a U-turn, head to Le Pontet, and then head towards PRENOVEL DE BISE, through the hamlet of l’Arête.

Cross the départemental road again and take a white path through pastures until you enter the hamlet of Belbenoits. Head back downhill to your left until you come to the Walkway.

Continue on the white path running parallel to the Nanchez forebay, crossing over the Janiers Bridge.

At La Vigne, head back to your starting point via the municipal road.

  • Departure : Nanchez, Annex town hall of Prénovel
  • Arrival : Nanchez, Annex town hall of Prénovel
  • Towns crossed : Nanchez and Grande-Riviere Chateau


Sensitive areas

Along your trek, you will go through sensitive areas related to the presence of a specific species or environment. In these areas, an appropriate behaviour allows to contribute to their preservation. For detailed information, specific forms are accessible for each area.
Impacted practices:
Aerial, Aquatic, Amenities, , Underground, Land-based
Sensitivity periods:
Conservateur : Laurane Parc Naturel Régional du Haut-Jura29 le village39310 LAJOUX03 84 34 12 30


This trail passes through pastures with livestock. To respect the owners and farmers granting you passage, to avoid flattening the hay, and for the security of livestock and wild fauna, we ask that you remain on the waymarked paths. Use the adapted passageways to get across fencing and be sure to close gateways behind you.

Please keep your dog on a lead if you have one.

In the peat bog and its surrounding fields, wild flowers are beautiful, they may be rare and protected and often wilt quickly. Do not pick them! They will delight the next hikers.

In case of forest works (felling, skidding, etc.), for your safety, know when to stop and turn around.

In the adapted area of the peat bog (boardwalk), between THE PEAT BOG and Le Pontet, for the safety of all and to respect this unique environment, there are a few additional rules:

  • Do not leave the boardwalk
  • Cycling is not authorised.

Information desks

Tourist information centre - Haut-Jura Grandvaux

7 place Simone Veil, 39150 Saint-Laurent-en-Grandvaux (0)3 84 60 15 25


To visit and get about in the High-Jura, visit, the eco-mobility portal listing all means of transport within the Park.

Access and parking

15 km from Saint-Laurent-en-Grandvaux, via the D 678, the D 146, followed by the D 28 and the D 232.

Parking :

Annex town hall of Prénovel in Nanchez.

Report a problem or an error

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