Factors such as the origin of the material involved in the profile equilibrium, or the rate of sea level rise are important in partially controlling the shoreline evolution. In the Gulf of Lions (Mediterranean Sea), the linear and crescentic offshore bars constitute another factor which prevents the use of simple models such as the power function y = ax super(b). A relevant parameter to improve our understanding seems to be the shape of the profile recorded normally to the shore and the definition of its interannual fluctuations. This project works out a number of regular surveys, in time and space, from permanently located landmarks. Each landmark constitutes an observatory and the measurements reported here: bathymetry, topography, sedimentology and coastal oceanography were gathered at the Saint-Cyprien one (Pyrenees-Orientales).