COAST-EIDGES AND SAND-BAES. 



175 



siderable dimensions. In France, all the shores of the Gulf of Lyons, 

 from Argelez-sur-Mer to the mouths of the Rhone, form a series of 



Fig. 77.— Coast-ridges between Port-Vendi-es and Aigues-Mortes. 



coast- ridges, only interrupted by the rocks of Leucate, of La Clape, 

 Agde, and Cette, and developed in a vast semi-circle nearly 125 miles 

 long. The numerous ponds or etangs which it now separates from the 

 Mediterranean, and which the alluvium of the rivers, the marine sand, 

 and invading agriculture, are unceasingly transforming into solid 



