Fort l’Écluse invites you on a unique journey with its breathtaking panoramas, enriching visits and cultural events.
Why come to Fort l’Ecluse?
Discover Fort l’Ecluse: an exceptional historical and cultural site
Fort l’Ecluse, located in Léaz in the Pays de Gex region, is a veritable fortress carved out of the rock and perched on the mountainside. This remarkable site, which bears witness to several centuries of military architecture, offers an uninterrupted view of the Rhône and the surrounding mountains.


Accessible by 1165 stone steps, the climb will not only test your endurance, but also give you the chance to enjoy some exceptional panoramic views. The effort is amply rewarded by the spectacle on offer at the top: a spectacular view that will take your breath away, and a diploma that you will receive at the Fort’s reception desk. An unforgettable souvenir of your climb!
A unique musical experience with Jazz in Fort l’Écluse
Jazz in Fort l’Écluse is the key musical event of the summer, offering jazz concerts in this historic setting.
International artists come to bring this festival to life in an exceptional setting, and the magic of the place adds an extra dimension to each performance. These musical evenings are an ideal opportunity to discover the fort from a different angle, immersing yourself in an atmosphere that is both vibrant and historic.
What’s more, the concerts are free!
Visits and events to discover
As well as the jazz festival, Fort l’Ecluse offers many other cultural experiences from May to September. The fort is a lively place where history and nature meet, with activities to suit all tastes:
- Guided tours: Immerse yourself in the fascinating history of the fort with guided tours that will reveal its secrets and its strategic role through the centuries. Learn more about the construction of the fort, its various military functions and the site’s importance in the history of the region.
- Exhibitions: The fort hosts temporary and permanent exhibitions on a variety of themes, including military architecture, biodiversity and local history.
- Cultural events: The fort also organises regular events such as plays, concerts, biodiversity events and even Starry Night, an evening of sky-watching, egg hunts and Halloween.

Check out the online diary to make sure you don’t miss any of the exhibitions and events taking place at this iconic venue.
To sum up, what’s in store for you…
Prepare your visit!
Practical information
Access
Would you like to come and discover this place steeped in history? There are several ways to get to Fort l’Ecluse:
- Fort l’Ecluse is easily accessible by car from Geneva (30 mins), Lyon (1hr 30mins) and Annecy (1hr). You can park in the fort’s car park, but beware: spaces are limited (around sixty), so make sure you arrive well in advance!
- During the festival, free shuttle buses are also available for spectators from Collonges. These will run non-stop from Collonges to Fort L’Ecluse from 7pm to 11pm. You can park your car in the Collonges car park.
Timetable
Fort l’Ecluse is open from 10.30am to 6.30pm at weekends in June, every day in July and August and at weekends until 21 September.
Offers and rates
- Full price: €6.
- Reduced rate (children aged 6 to 16, students and jobseekers with proof of enrolment, disabled people): €4.50
And don’t forget the twin ticket! Enjoy two of Pays de Gex’s landmark monuments at the reduced price of €12.
What our visitors have to say
"An impressive site carved out of the rock, with a splendid view of the Rhône!"
"A wonderful discovery! The sound and light show is captivating and pays tribute to the fort's history."
"The setting is unique, and the varied activities make the visit even more interesting. A must-see!"
"The jazz festival in this historic venue is a magical experience. Well done to the organisers!"

Advice from the team
FAQ
Are pets allowed?
Dogs are not permitted in the Fort l’Ecluse enclosure.
Is Fort l’Écluse accessible to people with reduced mobility?
Due to its historic layout and location on a mountainside, Fort l’Écluse has narrow staircases and passageways that may be difficult to access for people with reduced mobility. A lift is available to take you up to the terrace.
Are there any restaurants or picnic areas on site?
Fort l’Écluse does not have an on-site restaurant. However, picnic areas are available for visitors wishing to bring their own meals. You can also enjoy a drink at the Fort’s bar.
Can you practice via ferrata at Fort l’Écluse?
Yes, a via ferrata is available at Fort l’Écluse. This 400-metre-long course, with a 150-metre climb, is classified as difficulty C/D. It takes around 5 minutes to get to from the car park, and around 25 minutes to get off.
To find out more about Pays de Gex…
- The know-how trail
Come and meet the local craftsmen and producers: cheese makers, soap makers, wooden ski makers… An exciting route to discover the wealth of local crafts and delicacies. - Crozet Bike Park
For thrill-seekers, take to the trails at Crozet Bike Park, which are suitable for all levels and offer spectacular views of the Alps. - The Haute Chaîne du Jura Nature Reserve
Explore this unspoilt reserve, home to exceptional flora and fauna. There are plenty of walks where you can enjoy magnificent panoramas and spot chamois and marmots.