The preserved marine park "Les Posidonies du Cap d’Agde" covers 6,000 hectares of sea, boasts a very high level of biodiversity and extends up to 5 km out into the open sea and is sustainably coordinated, protected and managed with the help of all those actively involved in marine matters at local level (professional and amateur fishermen, divers, sailors, Cap d’Agde port authorities and archaeologists).