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Location Portugal, Lisboa e Vale do Tejo
Central coordinates 9o 30.68' West  38o 42.37' North
IBA criteria A1, A4ii, B1ii, C2
Area 58,900 ha
Year of IBA assessment 2008

Sociedade Portuguesa para o Estudo das Aves

Site description Coastal area that stretches from the Paço de Arcos beach in Oeiras, along Cabo Raso and Cabo da Roca and up to Samarra beach, north of Magoito. Part of the IBA overlaps with the marine area of the Sintra-Cascais Site of Community Importance. Naturally, it is an area with a large volume of maritime traffic of various types, as it is located at the entrance to Lisbon harbour. This highly productive IBA has an abundance of sediments and nutrients supplied by the river Tagus and is characterized by its shallow depths, mostly under 100m, a factor which favours the presence of the Balearic Shearwater (Louzao et al. 2006). South of Cascais, the presence of an underwater sewage outlet should be noted, the Guia sewage outlet, where large gatherings of various species of gull and other seabirds are observed. These may be benefiting directly or indirectly from the outflow of waste waters at this location.

Populations of IBA trigger species

Species Season Period Population estimate Quality of estimate IBA Criteria IUCN Category
Balearic Shearwater Puffinus mauretanicus winter  2007  1,200-4,300 individuals  poor  A1, A4ii, B1ii, C2  Critically Endangered 
Mediterranean Gull Larus melanocephalus winter  2006  6,000 individuals  medium  C2  Least Concern 

Protected areas

Protected area Designation Area (ha) Relationship with IBA Overlap with IBA (ha)  
Sintra - Cascais Habitats Directive 0 protected area overlaps with site 0  


IUCN habitat Habitat detail Extent (% of site)
Sea Sea inlets and coastal features  100%

Land use

Land-use Extent (% of site)
nature conservation and research 7%
Notes: SIC Sintra-Cascais (PTCON0008)
fisheries/aquaculture -
military -
tourism/recreation -

Protection status Sintra-Cascais SCI (PTCON0008); Cabinet Resolution nº 142/97, of 28th August - 7% of the area coincides with the IBA.

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Recommended citation  BirdLife International (2014) Important Bird Areas factsheet: Cabo Raso. Downloaded from on 23/10/2014

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