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Location Guinea, Kindia
Central coordinates 15o 23.00' West  10o 38.00' North
IBA criteria A4i, A4ii
Area 1 ha
Altitude 0 - 12m
Year of IBA assessment 2001

Site description Ile Alcatraz (0.75 ha) is a lateritic rock islet on the continental shelf of the Atlantic Ocean, 40 km south-west of Iles Tristao (IBA GN004). The Ile de Naufrage (0.25 ha) is a sandbank 2 km south-west of Ile Alcatraz which is exposed even at high tide. Ile Alcatraz is unvegetated and covered with guano to a depth of about 3 m, which is the cause of its white appearance. The Ile de Naufrage is also unvegetated and reaches a maximum height of c.3 m above high water. The intertidal area is mainly sandy.

Key Biodiversity See Box for key species. Ile Alcatraz holds the only known breeding colony of Sula leucogaster between Cape Verde and São Tomé and Príncipe. There is breeding activity throughout the year. The Ile de Naufrage provides a roost for thousands of terns including Sterna maxima, S. hirundo, S. sandvicensis, S. albifrons and Chlidonias niger.

Non-bird biodiversity: Among mammals, the dolphin Sousa teuszi (DD) and the sirenian Trichechus senegalensis (VU) are reported from the area; sea-turtles also occur.

Populations of IBA trigger species

Species Season Period Population estimate Quality of estimate IBA Criteria IUCN Category
Brown Booby Sula leucogaster breeding  1988  3,000 breeding pairs  A4ii  Least Concern 
Royal Tern Thalasseus maximus winter  1988  3,000 individuals  A4i  Least Concern 

IBA Monitoring

2001 medium not assessed not assessed
Good - based on reliable and complete / representative data

Pollution industrial & military effluents - oil spills likely in long term (beyond 4 years) some of area/population (10-49%) slow but significant deterioration medium

Protected areas

Protected area Designation Area (ha) Relationship with IBA Overlap with IBA (ha)  
Ile Alcatraz Wetlands of International Importance (Ramsar) 1 is identical to site 1  

Land use

Land-use Extent (% of site)
nature conservation and research -

References Altenburg and van der Kamp (1991a, b), Jones (1993).

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Recommended citation  BirdLife International (2016) Important Bird and Biodiversity Area factsheet: Ile Alcatraz et Ile du Naufrage. Downloaded from on 27/10/2016

To provide new information to update this factsheet or to correct any errors, please email BirdLife