on the line sillon de Guérande, orientated NW-SE; the town border is located on the Route de Guérande, D392d, at approximately 4 km from the shore, at a place called Pont de Terre (railway junction) at the Quatre Vents; on a coastal rock belt located upfront of the sillon de Guérande (same orientation), between two rock heads, the Pointe du Bec and the Pointe de la Lande (border with Saint-Nazaire), separated of 4.25 km; on sandy terranes part of the sand dune unit of Escoublac, between the place named Mazy (border with La Baule-Escoublac) and the Pointe du Bec (length: 2 km; width: 100 m at Mazy, 1 km at the head); on former swamp area (racetrack).