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Location Spain, Aragón
Central coordinates 0o 55.00' West  42o 40.00' North
IBA criteria A4ii, B1iii, B2, C2, C6
Area 34,700 ha
Altitude 600 - 1,477m
Year of IBA assessment 2000

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Site description The site includes the Sierra de los Dos Ríos mountain range, crossed by two gorges, with limestone cliffs, dense maquis and Pinus woodland. The main human activities are forestry and sheep-grazing.

Populations of IBA trigger species

Species Season Period Population estimate Quality of estimate IBA Criteria IUCN Category
Bearded Vulture Gypaetus barbatus resident  1996  3 breeding pairs  good  B2, C6  Near Threatened 
Egyptian Vulture Neophron percnopterus breeding  1996  8-11 breeding pairs  medium  C6  Endangered 
Griffon Vulture Gyps fulvus resident  1996  200 breeding pairs  medium  A4ii, B1iii, B2, C2, C6  Least Concern 
Egyptian Vulture Neophron percnopterus non-breeding  1994  22-100 individuals  good  B1iii, C2  Endangered 
Red-billed Chough Pyrrhocorax pyrrhocorax resident  1996  200 breeding pairs  good  B2, C2  Least Concern 

Protected areas

Protected area Designation Area (ha) Relationship with IBA Overlap with IBA (ha)  
FOZ DE BINIES - ES2410012 Habitats Directive 167 protected area contained by site 167  
FOZ DE SALVATIERRA - ES2430007 Habitats Directive 521 protected area contained by site 521  
LOS VALLES - SUR - ES2410001 Habitats Directive 14,655 protected area overlaps with site 8,342  
R Habitats Directive 385 protected area is adjacent to site 0  
RÍO VERAL - ES2410058 Habitats Directive 280 protected area overlaps with site 249  
SALVATIERRA - FOZES DE FAGO Y BINIÉS - ES0000282 Birds Directive 2,574 protected area contained by site 2,574  
Sierra de Illón y Foz de Burgui - ES0000124 Birds Directive 4,317 protected area is adjacent to site 0  
Sierra de Leire, Foz de Arbaiun - ES0000125 Birds Directive 8,375 protected area is adjacent to site 0  
Sierra de San Miguel - ES0000128 Birds Directive 2,834 protected area is adjacent to site 0  
SIERRAS DE LEYRE Y ORBA - ES0000283 Birds Directive 5,802 protected area overlaps with site 4,411  
SIERRAS DE LEYRE Y ORBA - ES2430047 Habitats Directive 7,015 protected area overlaps with site 5,558  
SIERRAS DE LOS VALLES, AÍSA Y BORAU - ES2410057 Habitats Directive 10,769 protected area overlaps with site 7,421  
SOTOS Y CARRIZALES DEL RÍO ARAGÓN - ES0000284 Birds Directive 1,932 protected area overlaps with site 280  

Habitats

IUCN habitat Habitat detail Extent (% of site)
Forest Broadleaved deciduous woodland; Native coniferous woodland  26%
Shrubland Sclerophyllous scrub, garrigue and maquis; Scrub  26%
Grassland   26%
Rocky areas Inland cliffs  -

Land use

Land-use Extent (% of site)
agriculture -
forestry 26%
hunting 26%
not utilised -

Protection status National None International None

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Recommended citation  BirdLife International (2014) Important Bird Areas factsheet: Dos Ríos and Orba mountain ranges. Downloaded from http://www.birdlife.org on 21/08/2014

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