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Grande Traversée du Jura on foot: From Culoz to La Borne au Lion

1 alert on this circuit

LES PERTES DE LA VALSERINE, ENS DE L'AIN:

Alerte visiteurs

Pour des raisons de sécurité, la circulation des piétons et cyclistes est interdite sur la portion comprise entre l'accès situé parking des Berges de la Valserine rue Louis Dumont (centre-ville) et le barrage de Métral et ce jusqu'à nouvel ordre.

Grande Traversée du Jura on foot: from Borne au Lion to Culoz_Champfromier
Grande Traversée du Jura on foot: From Culoz to La Borne au Lion
Grande Traversée du Jura on foot: from Borne au Lion to Culoz_Champfromier
Grande Traversée du Jura on foot: from Borne au Lion to Culoz_Champfromier
Grande Traversée du Jura on foot: From Culoz to La Borne au Lion

Description

This Grande Randonnée (GR®) trail runs through the Jura Mountains from Mandeure, near Montbéliard in the Doubs in the north, through the Jura to Culoz in the Ain in the south.

The GTJ crosses the entire Haut-Jura Regional Nature Park, with a foray into neighbouring Switzerland. Inaugurated in 2004, the GTJ on foot follows the Grande Randonnée GR® 5 and GR® 9 trails, as well as the GR® de Pays.
With the Grande Traversée du Jura on foot, lovers of nature and wide-open spaces will experience intense moments in a gentle mountain environment. Undulating over ridges, spanning cluses, emerging from a forest to skirt a lake, this is a gentle itinerary with no particular difficulties, taking in the most beautiful paths in the Jura Mountains.
Accessible to all, it offers a total of 400 km of trails and a multitude of different landscapes and atmospheres.
To meet every hiker's needs, the trail can be adapted to suit every taste: from 2 to 3-day hikes well-suited to families, to walks for hikers in search of rejuvenation, to more physically demanding hikes, and why not ... the complete route, to be completed in 15 or 20 days.
The route runs through the heart of the Haut-Jura Regional Nature Park, and part of it passes through the Haute Chaîne du Jura National Nature Reserve: a protected, unspoilt area that should be explored with respect.

Good to know - Protected area
Part of the route passes through the Haute Chaîne du Jura National Nature Reserve, which is subject to special regulations:

Dogs are not allowed, even on a lead.

Camping in tents is prohibited.

Please respect these rules to preserve the richness of this exceptional environment.

Technical Information

Walking
Difficulty
Hard
Dist.
96 km
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Altimetric profile

Starting point

01410   Champfromier
Lat : 46.265401Lng : 5.869274

Points of interest

image du object

Grand Colombier Mountain range

Located to the south of the Jura Massif and Bugey’s highest point (1531 m), with over 100 km of marked hiking trails (GR9, LWG, GR) and panoramic views on the Alps (Belledonne and Mont Blanc), Bugey, Rhone, lake Bourget and Lake Annecy and Leman. There is the opportunity to discover various sites and landscapes: forests, grasslands, grangeons (temporary accommodation for winemakers) the Chartreuse Arvières ruins, ridge roads and panoramic views on the Alps.The summit of the Grand Colombier offers exceptional views of the Belledonne and Mont-Blanc massifs, the Bugey region, the Rhône, Lac du Bourget, Lac d'Annecy and Lac du Léman. The "giant of Bugey" offers a variety of sites and landscapes to admire: forests, meadows, barns, the ruins of the Chartreuse d'Arvières and panoramic views of the Alps. Two orientation tables: - "le Fenestrez" (Altitude: 1,150 m): from Culoz, follow the RD120, then at the Sapette crossroads, the D120b on the left. - La Croix" (altitude 1,525 m): from Culoz, follow the RD120 towards Col du Grand Colombier. Parking lot nearby. This massif has all the characteristics of the Jurassic era: firstly, alternating mountains and valleys: the mountain is surrounded to the west by the Valromey depression and to the east by the Lavours and Chautagne marshes. It reappears as a "mollard" at Lavours and Vions. The limestone rock, carved out by heavy rains, has given rise to picturesque sites such as the Thurignin gorges in Valromey, the Cerveyrieu waterfall near Artemare, the Groin canyon, etc... You can drive through the massif on the D120 from Culoz (where the climb is particularly spectacular), Anglefort, Virieu-le-Petit or Lochieu. There is a parking lot near the Iron Cross overlooking the massif.

Culoz 01350 Culoz-Béon
- Office de Tourisme Bugey Sud Grand Colombier -
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Lèbe Observatory

Located in Valromey sur Séran in the Bugey Sud, the Observatoire de la Lèbe is entirely dedicated to the discovery of astronomy for all.How about taking the time to observe the stars? A unique place in the Ain, the Observatoire de la Lèbe in Valromey sur Séran in the Bugey Sud offers you the opportunity to familiarise yourself with the galaxies, stars and planets through fun and exciting astronomical activities. All year round, upon reservation, the Observatoire de la Lèbe offers you : Planetarium sessions: Come aboard the planetarium for a virtual trip with striking realism. Guided by our scientific mediator, discover constellations, planets, nebulae, galaxies and other unsuspected wonders of the deep sky. The session consists of a film followed by a presentation of the sky by the presenter. A dive into the heart of the starry sky comfortably installed in a in a recliner. Duration: 1 hour. Sessions from Monday to Saturday (summer and school holidays). Other dates possible on reservation. Planetarium films: >Blind with starry eyes >Lucia, the secret of shooting stars >Voyager, the endless journey >From the earth to the universe >The sun, our living star Find the screenings on the agenda of our website. To schedule a session outside the dates already programmed, please contact us. More information by phone or on our website. Sun observations: observe the surface of the sun live in a 120 mm telescope equipped with a professional solar filter. Observation evenings for all: >Observation evenings: discover the sky with the naked eye and telescopes... >Family evenings" experience the magic of shooting stars and constellations in the planetarium and continue with an observation with instruments. >Celestial legends" evenings: learn to recognise the constellations and be lulled by their mythological tales. >Evscope" evenings The digital telescope that has revolutionised sky observation in recent years. Information, reservation by phone and on the internet: www.observatoiredelalebe.fr/soirees-dobservation/ Free access: Rediscover the path of the stars and its booklet sold at the Observatory and at the OT Bugey Sud Grand Colombier and spend a great moment in family in total autonomy. and have a great time with your family in total autonomy. Available every day of the year. Our course The bestiary of the sky focuses on the constellations and the animal figures associated with them. The Observatory also offers courses for adults and children. It is open all year round for groups (schools, leisure activities, associations, works councils, families...). Programmes Specific programmes on request.

669 Chemin des Etoiles Le Puy des Barres Sutrieu 01260 Valromey-sur-Séran
- Office de Tourisme Bugey Sud Grand Colombier -
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Nature reserve of Lavours marsh.

The Lavours Marsh is one of the last remaining giant marshlands in continental Western Europe. Located near Ceyzérieu in the shadow of the Grand Colombier the marsh covers an area of 500 hectares and is traversed by a wooden footbridge 1.2km long.The Lavours Marsh was declared a Nature Reserve in 1984 to protect the rich and diverse flora and fauna that exists there. Visitors can view this remarkable marshland from a 1.2km long wooden pathway on stilts that allows access right to the very heart of the marsh. All along this pathway there are signs in both French and English that give explanations about the various plants and animals that exist in the marsh. The pathway is accessible to wheelchair users and all the signs are available in Braille for the visually impaired. The only entrance to the Lavours Marsh is located in the hamlet of Aignoz, here you will find plenty of free parking and the Maison du Marais, an interpretative centre that explains the history and life of the marsh. Each year at the Maison du Marais between April and October a program of various events is scheduled that allows the public discover more about the marsh’s flora and fauna and heritage. To access to the swamp, a mandatory parking is at visitors disposal free of charge, at the entry of Aignoz hamlet. It is important de respect the natural reserve regulation: dogs and gathering forbidden. The stilt walk is accessible to people with reduced mobility with the help of an accompanying person.

Hameau d'Aignoz 01350 Ceyzérieu
- Office de Tourisme Bugey Sud Grand Colombier -
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Additional information

Environments

Panoramic view
In a nature reserve

Updated by

Aintourisme - 24/11/2025
www.ain-tourisme.com
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Contact

Phone : 03 84 51 51 51

Website : https://www.gtj.asso.fr/

Type of land

Rock
Stone
Ground
Hard coating (tar, cement, flooring)

Reception complements

▶ This route crosses the Haute Chaîne du Jura National Nature Reserve. Please respect the regulations.

The rules include the following:
Dogs are strictly forbidden, even on a lead.
Plant picking and mineral collecting are also prohibited.

▶ Before setting off :

Check the general and local weather forecast, and make sure there's no precipitation.
Find out about the approach route, the height of the itinerary, the time it will take to complete the climb, and any possible escapes (IGN map, GPS, topo-guide, etc.).
Evaluate possible risks by asking mountain professionals, mountain huts and gîtes.
Inform someone close to you of your objective, and contact them again in the event of any changes: departure and return times, number of participants with telephone numbers for each, vehicle(s), parking, etc.
Avoid setting off alone, and use equipment that is suitable for the activity, adjusted and in good condition: headlamp, complete first-aid kit, survival blanket, etc.
In the event of a problem, call 112 (European emergency number).

▶ The Patou or guard dog: what attitude should you adopt?

When out hiking, it's not uncommon to come across flocks of sheep or goats guarded by guard dogs known as patous. These dogs, formidable against predators such as wolves, bears and lynxes, can frighten hikers with their barking.
The patou protects flocks in total autonomy. Its main role is to deter intruders and alert the shepherd. Raised among the ewes from an early age, he learns to protect them at all times, often in groups.

▶ To avoid problems with a patou:

Identify grazing areas before setting off.
Keep your distance and go around flocks if possible.
In the event of an encounter, stay calm, turn back slowly or stop to let the dog sniff you out.
Don't try to pet or feed the animals, avoid sudden movements, don't run, and avoid taking photos.

▶ For runners:

Do not run when approaching a herd.
Take off your headphones to hear the dog's barking.

By adopting these behaviors, you'll be able to cohabit serenely with guard dogs on your hikes.

Guidebook with maps/step-by-step

▶ Day 1: Culoz -> Chalet d'Arvière, approx. 6h30
Distance: 19.8 km
Difference in altitude: 1333m D+ / 386m D-
From Culoz, follow the Gr (red and white) towards Pont de la Magnine, Fenestré viewpoint, Granges neuves, Grange à Masse, Col du Colombier, Croix du Colombier, Col de Charbemène, Sapin Daubré, then Chalet d'Arvières.

▶ Day 2: Chalet d'Arvières -> Les Bergonnes.
Distance: 15.4 km
Difference in altitude: 349 D+ / 334 D-
Itinerary: From Chalet d'Arvières, continue on the GR towards Grande d'en Bas, Grange d'en Haut, Col de Richemond, Crêt Dauphin, Planvanel, Croix des Terments, pick up a yellow PR to Les Bergonnes.

▶ Day 3: Les Bergonnes -> Lancrans, approx. 6h15
Distance: 22, 3 Km
Difference in altitude : 342 D +/ 1061 D-
Itinerary: From Les Bergonnes, take the yellow PR towards Croix des Terments, pick up the GR, then follow Crêt du Nu, Tumet, Charnay, Pra Devant, Catray, down to Ochiaz, Mussel, Rue de Lafayette, Gare de Bellegarde, les Pertes de la Valserine, then back up to Lancrans.

▶ Day 4: Lancrans -> Refuge du Gralet 6h30
Distance: 17.8 km
Difference in altitude: 1355 D+/ 399D-
Itinerary: From Lancrans, take the GR towards Métral, Sorgia d'en Haut, Crêt de la Goutte, chalet du Sac, la Corne, la Pelaz, la Poutouille, then le Gralet.

▶Day 5: Refuge du Gralet -> Refuge de la Loge 4h30
Distance: 11.1 km
Difference in altitude: 434m D+ / 438m D-
Itinerary: From the Refuge du Gralet take the GR towards Le Reculet, follow the crest to reach it, follow the Crêt de la Neige, then descend towards La Loge via Sous le Crêt, Les Brulats, Combe des Voyettes and Refuge de la Loge.

▶ Day 6: Refuge de la Loge -> La Borne au Lion, approx. 4h30
Distance: 11.4 km
Difference in altitude: 649 D+/ 505 D-
Itinerary: From the Refuge de la Loge, descend towards Le Ratou on the GR, follow Lélex, Route du Frenet, le Niaizet, les Closette, Col du Crêt au Merles, then La Borne au Lion.

Animals

No. Dogs strictly forbidden in the Haute Chaîne du Jura National Nature Reserve

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Caution!
We have no information on the difficulty of this circuit. You may encounter some surprises along the way. Before you go, please feel free to inquire more and take all necessary precautions. Have a good trip! 🌳🥾