GSC convex tablet stamped 70L812, set horizontally in the west foundation wall of the Coteau-du-Lac post office, southwest of the intersection of Route 201 and Chemin du Fleuve, at street address 338. The marker is located 2.88 m from the west corner of the foundation wall, 0.11 m below the brick wall, 0.14 m above the asphalt surface and 6.69 m from the south corner of the foundation wall.