Bahía de San Quintín. 02/02/08 ; Baja California ; 5,438 ha; 30°26'N 115°58'W. Located in a Mediterranean transitional biogeographic region between temperate and subtropical zones, the site is home to a number of threatened or endangered bird species such as Rallus longirostris levipes, Laterallus jamaicensis, Sterna antillarum browni, Passerculus sandwichensis beldingi, Polioptila californica atwoodi and Charadrius alexandrinus nivosus, and holds the densest population of Polioptila californica atwoodi couples. It is the only area in the Pacific coast of Baja California where Laterallus jamaicensis have been sighted. More than 25,000 migratory waterbirds hibernate in the wetland, which supports 30-50% of the total Branta bernicla nigricans population during that period. Astragalus harrisonii, Chorizanthe chaetophora, Chorizanthe interposita, Chorizanthe jonesiana are endemic flora species of the Mediterranean area found here. The collection of bivalve mollusks, mining, salt mines, hunting, livestock and sand and gravel extraction are among the most important economic activities carried out in the site. The extensive use of agrochemicals, as well as disorganized urban growth, are the main factors that negatively affect the bay. Ramsar site no. 1775. Most recent RIS information: 2008.