3 km long, it is the largest sandy beach in Saint-Malo. By following this beach, you can reach Intra-Muros in Paramé. The Sillon beach includes the Grande plage, the Hoguette beach and the Rochebonne beach.

La Digue was built from 1883 to 1913 on an old sand spit (le Sillon) which once linked Paramé to the walled city and which was the only dry access at low tide.
Originally, a strip of sand was covered with dunes that grew higher and higher as you headed towards Rochebonne, with only a succession of windmills as buildings. The first causeway was built in 1509, rebuilt and widened several times...
Le Digue, 1671 meters long, runs along the Grande plage and offers a pleasant stroll, lined with many villas built towards the end of the 19th century.

Along the Sillon, a line of breakwaters protects the sea wall from the force of the waves. Built at the beginning of the 19th century on an idea of ​​the engineer Ponts et Chaussées Robinault de St-Servan, the oak breakwaters have a depth at least equal to or greater than their visible height.

The Sillon beach is pleasant for swimming, and offers good conditions for windy activities: kite flying, sand yachting, windsurfing, etc.
Supervised beach with first aid station in summer

The beach is prohibited to animals from April to September.