Fort du Mengant, Military fort in Plouzané, France

Fort du Mengant in Plouzané has a high battery 58 metres above sea level, where an artillery tower once stood, and a lower semicircular battery at the foot of the cliff containing two small powder magazines. A stone ramp built in the 1960s links the small harbour to the upper level. A red-bordered sign by the waterline arch reads "INTERDIT AU PUBLIC".

Construction began in 1684 under engineer Vauban's direction to defend Brest's strategic harbor entrance, working in tandem with nearby Fort Cornouaille as part of a broader defensive network. The fort underwent modifications and upgrades throughout the 18th and 19th centuries as weaponry and fortification techniques evolved.

The fort's name appears in both forms, Mengant and Mingant, and it is also called fort du Léon. Its lower battery now houses the annexe of the Centre Nautique des Équipages de la Marine, while the upper battery serves for radar testing. A red-bordered sign by the waterline arch reads "INTERDIT AU PUBLIC".

The lower battery now houses the annexe of the Centre Nautique des Équipages de la Marine, and the upper battery is used for radar tests, so parts of the site are off-limits; a red-bordered sign by the waterline arch reads "INTERDIT AU PUBLIC". A long stone staircase climbs from the arch to the upper level, and an imposing ramp built in the 1960s links the small harbour to the upper battery.

The two small powder magazines still stand in the lower semicircular battery at the foot of the cliff. The original plan to add a battery on the Roche Mengant, a dangerous reef mid-channel blamed for the 1794 wreck of the Républicain, was abandoned because of the tides and currents of the goulet.