Salt marshes may be formed behind a spit. The zone behind a spit becomes a sheltered area. Water movement slows down and so more material is deposited. Deposition may form a salt marsh.

A series of such hooks can develop over time. The spit creates an area of calmer water, sheltered by the spit. A lagoon, salt marsh and finally dry land can develop in this sheltered area.

Just outside of the town lies an extraordinary natural attraction, the Salins d'Áigues Mortes, or the Aigues-Mortes Salt Marsh. These expansive salt flats are a spectacular lake of pink ...