Mar Menor (Spanish pronunciation: [ˈmar meˈnor], "Minor sea") is a salty lagoon, in the south-east of the autonomous community of Murcia, in Spain, separated from the Mediterranean sea by La Manga, a sandbar 22 km in length and with a width ranging from 100 to 1200 m.
It belongs to four municipalities: Cartagena, Los Alcázares, San Javier and San Pedro del Pinatar. With a surface area of nearly 170 km², a coastal length of 70 km, and warm and clear water no more than 7 m in depth, it is "the largest swimming pool in the world", in the opinion of famous swimmer and Hollywood actress Esther Williams.
Its relatively high salinity, which aids flotation, and remarkable sporting infrastructures make this one of the most popular places in Europe for a wide variety of water sports.
First the Phoenicians and then the Moorish kings, chose this "small sea" as the site of their summer residences. Today, this area attracts all those who seek a quiet place to rest and relax, with ideal weather conditions all year round.
Ecological importance of the Mar Menor
At the northern end there are salt-flats which include a wetland of international importance. This area is conserved as a natural park administered by the regional government. Its Spanish name is "Salinas y Arenales de San Pedro del Pinatar". The microbes that live in this coastal lagoon have been recently described. 
In 1994 the Mar Menor was included on the Ramsar Convention list for the conservation and sustainable utilization of wetlands. The Mar Menor is also part of a Specially Protected Area of Mediterranean Importance and is a Special Protection Area (ZEPA in Spanish) for bird life.
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