Fort de Lenlon, Military fort in Névache, France

Fort de Lenlon is a two-storey masonry infantry work on the Crête de Lenlon in the commune of Névache, Hautes-Alpes, at 2,508 m. Its hemicyclical, crenellated wall of moellon blocks curves to the south-east, with a rear annex, a flat roof ringed by a parapet and narrow loopholes. A metal railing follows the base of the wall. Each floor held about forty men.

The fort was built between 1890 and 1893 and formed part of the Dauphiné fortified sector within the southeastern Maginot Line. It was constructed during a period when France modernized its mountain defenses to ward off potential threats from the Italian border.

The fort's semicircular, crenellated shape earned it the nickname 'Boyard haut-alpin', after the French TV-show fortress Fort Boyard. It was a private property from the 1960s, and after World War II a shepherd used the building. Visitors today see the exterior only; the interior is generally not accessible.

Access is via a hiking trail that starts from the Plampinet parking area and ascends through mountain terrain with about 1,100 meters of elevation gain. The journey takes several hours on steep paths, so good footwear and physical fitness are essential.

The fort's flat roof is not covered with a protective layer of earth, unlike other fortifications in the area. Its curved, crenellated shape earned it the nickname "Boyard haut-alpin", after the sea fort of Fort Boyard. Since the 1960s it has been private property, and after World War II a shepherd used the building.