Ouvrage La Déa, also known as the Petit Ouvrage de la baisse de la Déa, is a lesser work (petit ouvrage) of the Maginot Line's Alpine extension, the Alpine Line. The ouvrage consists of two entry blocks and one observation block facing Italy at an altitude of , armed with one observation cloche and one machine gun embrasure. The ouvrage was manned by 81 soldiers in 1940, and commanded by sous-lieutenant Guillemin. The position was sited to control the Maglia valley. A fourth block with three machine gun positions was not built.