Entirely sandy, the Camargue coastline has varied over the centuries under the effect of erosion and the sediment deposits carried by the Rhône. It stretches over 59 mi (95 km) between Grau-du-Roi and Fos-sur-Mer and gives pride of place to the dunes. Formerly of fluvial or marine origin, those erected by the Rhône have largely been leveled for agricultural needs, while the coastal dune ridge has remained very present.