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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


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.

Key Biodiversity This is an important site for cliff-nesting raptors and an important roosting site for Neophron percnopterus.

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 


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 (2016) Important Bird and Biodiversity Area factsheet: Dos Ríos and Orba mountain ranges. Downloaded from on 22/10/2016

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