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Location Spain, Navarra
Central coordinates 1o 4.00' West  42o 42.00' North
IBA criteria A4ii, B1iii, B2, C2, C6
Area 23,500 ha
Altitude 400 - 1,420m
Year of IBA assessment 2000

SEO/BirdLife



Site description An area of limestone cliffs and several large gorges. The vegetation includes alpine grassland, scrub, and Quercus, Fagus and Pinus forests. The main human activities are forestry, hunting and livestock-grazing.

Key Biodiversity This is an important site for cliff-nesting birds and a wintering site for Perdix perdix. The site holds the largest Gyps fulvus colonies in Spain.

Populations of IBA trigger species

Species Season Period Population estimate Quality of estimate IBA Criteria IUCN Category
Falco peregrinus resident  1991  9 breeding pairs  good  C6  Not Recognised 
Griffon Vulture Gyps fulvus resident  1994  668 breeding pairs  good  A4ii, B1iii, B2, C2, C6  Least Concern 
Bearded Vulture Gypaetus barbatus resident  1996  4 breeding pairs  good  B2, C6  Near Threatened 
Egyptian Vulture Neophron percnopterus breeding  1991  25 breeding pairs  good  B2, C6  Endangered 
Golden Eagle Aquila chrysaetos resident  1991  7 breeding pairs  good  C6  Least Concern 
Black Woodpecker Dryocopus martius resident  1992  6-10 breeding pairs  medium  C6  Least Concern 

Protected areas

Protected area Designation Area (ha) Relationship with IBA Overlap with IBA (ha)  
Foz de Arbayun Nature Reserve 1,164 protected area contained by site 1,164  
Foz de Benasa Nature Reserve 153 protected area contained by site 153  
Foz de Burgui Natural Reserve 115 protected area contained by site 115  
Foz de Lumbier Nature Reserve 40 protected area contained by site 40  
Mendibeltza Wild Fauna Reserve 160 protected area contained by site 160  

Habitats

IUCN habitat Habitat detail Extent (% of site)
Forest Broadleaved deciduous woodland; Broadleaved evergreen woodland; Mixed woodland; Native coniferous woodland  80%
Shrubland Heathland; Sclerophyllous scrub, garrigue and maquis; Scrub  20%
Grassland Alpine, subalpine and boreal grassland  -
Rocky areas Inland cliffs  -
Artificial - terrestrial Arable land  -

Land use

Land-use Extent (% of site)
agriculture 90%
forestry 80%
hunting 90%

Protection status National Low International Partial393 ha of IBA covered by Natural Reserve (Acantilados de la Piedra y San Adrián, 393 ha). 1,164 ha of IBA covered by Natural Reserve (Foz de Arbayun, 1,164 ha). 153 ha of IBA covered by Natural Reserve (Foz de Benasa, 153 ha). 115 ha of IBA covered by Natural Reserve (Foz de Burgui, 115 ha). 40 ha of IBA covered by Natural Reserve (Foz de Lumbier, 40 ha). 160 ha of IBA covered by Wild Fauna Reserve (Mendibeltza, 160 ha). 2,987 ha of IBA covered by Special Protection Area (Sierra de San Miguel, 2,987 ha). 9,020 ha of IBA covered by Special Protection Area (Foz de Arbayun-Sierra de Leyre, 9,020 ha). 4,619 ha of IBA covered by Special Protection Area (Foz de Burgui-Sierra de Illón, 4,619 ha).

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Recommended citation  BirdLife International (2015) Important Bird Areas factsheet: Leyre, Illón and San Miguel mountain ranges. Downloaded from http://www.birdlife.org on 24/05/2015

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