These are the same formations that are in the catchment areas of rivers that flow into it. The south is limited by a series of barrier islands of coastal sandy barrier that separates the Atlantic Ocean, and from Quarteira (Loulé Municipality of), take the NO-SE direction to Cape Santa Maria (Parish of Faro). To the east of this cable, it bends, flexing in the direction of SO-NE to Cacela (Vila Real de Santo António)
The islands "barrier" (from west to east) are known to Peninsula Ancão (Garrão Beach Dunes gild, Quinta do Lago, Praia de Faro) Islands Barreta, Culatra, Armona, Tavira, Cabanas and Cacela Peninsula
The six tidal inlets that separate them have different characteristics, according to whether west or east of Cape Santa Maria, and are designated by bars area of São Luís or Ancão, Loule - Faro - Olhão and Armona, Fuzeta, Tavira and Lacém
With an average depth of 2 m and an irregular positioon of the soils, the lagoon is characterized by an extensive intertidal area occupied by sprawling tidal and bars, that have significant influences on the system of tidal currents. About 14% of the lagoon is permanently submerged, and about 80% of the soils emerge during low tide under the tides
The waterways leading into the lagoon of Ria Formosa (rivers: Rio Seco, Gilão, streams of Almargem and Almancil (Ludo), Lacém, Cacela, and others) are seasonal, with a torrential regime, given the low rainfall site. Thus, the Ria Formosa is fueled almost entirely by ocean water.
The Natural Park of Ria Formosa is part of a region's Mediterranean climate, the performance of semi-arid, with a long dry season during the summer months, with mild winters due to the influence of the flow from the west Atlantic, and the fact that to find out the regions of origin of the masses of continental polar air
Inserted in the south of Portugal, has climatic characteristics of transition to the sub-tropical, where rainfall is low and irregular, temperatures are mild, with rainfall of between 450 mm and 18 º C and 3150 hours of sunshine
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