The Mar Menor is a saltwater lagoon located in the region of Murcia, belonging to the Mediterranean Sea. It is the most extensive Spanish albufera and possesses great environmental values.
It has a semicircular shape, and separates the Mediterranean Sea a strip of sand 22 km long called La Manga, which has between 100 and 1,200 m wide. The Mar Menor has 73 kilometers of coastline, with beaches with clear, shallow water of up to seven meters.
In its lower limit is Cabo de Palos with its distinctive lighthouse. To the south there are five islands of volcanic origin: three major islands: island Perdiguera Island Mayor and Baron and Deer Island; and two smaller islands, or Round Island and Isle of Rondella subject.
The shores of the Mar Menor belong to the municipalities of San Javier (Santiago de la Ribera and most of La Manga), San Pedro del Pinatar (Lo Pagan and Los Cuarteros), Los Alcázares and Cartagena (Los Urrutias, Grandchildren and part La Manga), the municipality with more extension of the Mar Menor coast