| Fort Mahon | |
|---|---|
Fort d'Ambleteuse or Fort Vauban | |
| Near Ambleteuse in Pas-de-Calais in France | |
 Seaward view of Fort d'Ambleteuse | |
| Coordinates | 50°48′19″N 1°36′02″E / 50.80528°N 1.60056°E |
| Height | 15 m (49 ft) |
| Site information | |
| Owner | Association of Friends of the Fort Ambleteuse |
| Open to the public | yes |
| Condition | Restored |
| Purpose | Coastal artillery |
| Website | http://asso.nordnet.fr/fortdambleteuse/Accueil.html |
| Site history | |
| Built | 1680 |
| Built by | Sébastien Le Prestre de Vauban |
| In use | 17th century to 1945 |
| Materials | Stone |
| Garrison information | |
| Garrison | French Army |
Fort Mahon (French: Fort d'Ambleteuse or Fort Vauban) is a sea fort by the commune of Ambleteuse in the Pas-de-Calais, northern France. The fort was built at the end of the 17th century by the military architect Vauban on the orders of Louis XIV to defend the port in the estuary of the Slack. It was designated a Monument historique in the 1960s.