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City and culture, Mountains

The Fort l’Ecluse : place to discover this summer!

The Fort l’Écluse was erected in the 13th century to face the most tenacious invaders. Being a strategic passage between the Kingdom of France and Savoy, this passage on the Rhône has been the focus of many conflicts over the centuries. Watchtowers, casemates, ammunition chambers… The site is a genuine labyrinth in a protected area of over 1800 hectares.

The Fort l’Écluse is built into a mountainside at the foot of the Grand Crêt d’Eau (1621m), one of the highest peaks in the Jura Mountains!

Facts: This site has a lower and an upper fort, and 1165 steps cut into the rock to form an underground staircase linking the two forts. Up there, visitors can admire the Rhône, the Mont Blanc and Geneva. Keen climbers can even earn a diploma after the 830 steps climb.

Guided tours, temporary exhibitions, bat observation site, Via Ferrata, adventure park, concerts, sound and light show…

Fort l’Écluse is a place for bats with seven species of these small mammals regularly use the fort as a breeding, transit, or hibernation site.  Because of the exceptional richness of the site, it has become a priority site for the conservation of bats in the Geneva area.

The Geneva CCO has been studying these species for more than thirty years. Experience the intimate world of bats through a system of infrared cameras and ultrasonic sensors installed in their shelters, for live observation!

Open every weekend from 7 May to 17 June and every day from 18 June to 18 September (10am-6.30pm)

Full price: 6€ – Reduced: 4.50 € – Family rate (2 adults and 2 children): 17 €.

Combined ticket Fort l’Écluse + Château de Voltaire : €10

A key site for the conservation of bats in the Geneva area.


Jazz in Fort L’Ecluse © Agglo Pays de Gex (2)

Fort L’Ecluse © N. Gasgard

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