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.





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.
Panoramic view
In a nature reserve
Aintourisme - 24/11/2025
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Website : https://www.gtj.asso.fr/
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▶ 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.
▶ 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.
No. Dogs strictly forbidden in the Haute Chaîne du Jura National Nature Reserve