Coastwatch is a project of environmental education and awareness that consists in the monitoring of stretches of coastline and in the filling in of a questionnaire pertaining to each stretch. The methodology of the project is simple. Summing up the information obtained from the questionnaires for the entire coast (the inner limit of the coast has been defined as the mouth of estuaries). The working basis are blocks of 5 km of coastline, divided into 10 units of 500m, delimited in maps at a 1/25.000 scale