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Fort l'Écluse

Léaz Open
  • © Fort l'Écluse - Patrick Jacquet
  • © Fort l'Écluse - Fort l'Ecluse

At the Pays de Gex gateway, Fort l'Ecluse, a formerly military site, is one of three examples of mountain fortifications in France during the first half of the XIXth century.
The fort now welcomes the public and offers a rich and varied cultural season from June to September.


  • Love jazz ? Our exclusive program presents internationally renowned groups and runs from June to September.
    And what’s more, this 13th century fort, rebuilt over the years until the 19th century, is one of the major regional bat protection sites. Here, you can see, hear and observe them in their thousands – a truly thrilling sight ! An exhibition completes the visit, with plenty of surprising facts about this misunderstood animal.
    New : the sound and light show immerses you in the fascinating history of Fort l'Ecluse, which takes place in a 13-minute sequence on the front façade. Subscribe to our newsletter at

    In the heart of the Gex transversal valley, the site of Fort l'Ecluse is a natural, strategic passage between the Jura and the Alps since Roman times.
    Constructed at the place of a 13th century fortified dwelling, Fort l'Ecluse has always played the role of a border. When it became French in 1601, the Royal engineers enlarged and reinforced the buildings. At the beginning of the 19th century, the fort dug directly in the rockbed was restructured in 2 phases to accommodate a strengthened fortification.

Complément accueil

One 60-seat meeting room. Fast food on site with regional products. Refreshment bar.


  • Coach access
  • Shop
  • Tourist brochures
  • Tourist information
  • Guided tours


  • Waterside
  • Riverside


Full price: 6 €
Reduced price: 4.50 €
Group adults: 5.50 €
Group children: 4 €.

Group rate available for > 20 people.

Payment methods

  • Bank/credit card
  • Check
  • Cash

Opening period

From 01/06 to 30/06/2024, every Saturday and Sunday between 10.30 am and 6.30 pm.

From 01/07 to 01/09/2024, daily between 10.30 am and 6.30 pm.

From 05/09 to 08/09/2024, every Wednesday, Thursday, Saturday and Sunday between 10.30 am and 6.30 pm.

From 14/09 to 22/09/2024, every Saturday and Sunday between 10.30 am and 6.30 pm.

Spoken languages

  • German
  • English
  • Spanish
  • French
  • Italian
  • Arab

Adapted tourism

  • Accessible for wheelchairs with assistance
  • Accessible for self-propelled wheelchairs
  • Reserved space 330 cm wide < 100 m from the site
  • Minimum aisle width of 90 cm
  • Doors >=77 cm wide
  • Lift (80 x 130 cm) and door >= 77 cm
  • Reception desk between 70-80 cm high
  • WC + grab handle + adequate space to move
  • Incline >5% but reasonable
  • Visual alarm with flash light
  • Reception staff sensitized to the reception of people with disabilities


On the RN 206, at the exit of Bellegarde-sur-Valserine take direction of the Pays de Gex and Geneva.


Pets allowed : No


Fort l'Écluse
  • 19th C
  • 17th C
  • 18th C
Longeray 01200 Léaz
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