The Fort du Replaton is a fortification of the Séré de Rivières system in Modane, France.

The fort was built to provide artillery cover for the French end of the Fréjus Rail Tunnel 800 metres (2,600 ft) away horizontally.

[1] It is connected to Modane by an aerial tram, which continues on from Replaton to the Fort du Sapey on a much higher eminence.

[1] Unlike a Maginot fortification, Replaton was enclosed by a perimeter wall and had surface barracks.

[2] A smaller fortification occupies the eastern extremity of the small plateau, about 150 metres (490 ft) above Modane.