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close| 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 |
Ornithological information This is an important site for cliff-nesting raptors and an important roosting site for Neophron percnopterus.
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 |
|---|---|---|---|---|---|---|
| Lammergeier Gypaetus barbatus | resident | 1996 | 3 breeding pairs | good | B2, C6 | Least Concern |
| Egyptian Vulture Neophron percnopterus | breeding | 1996 | 8-11 breeding pairs | medium | C6 | Endangered |
| Egyptian Vulture Neophron percnopterus | non-breeding | 1994 | 22-100 individuals | good | B1iii, C2 | Endangered |
| Griffon Vulture Gyps fulvus | resident | 1996 | 200 breeding pairs | medium | A4ii, B1iii, B2, C2, C6 | Least Concern |
| 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 | |
| RÍO VERAL - ES2410058 | Habitats Directive | 280 | protected area overlaps with site | 249 | |
| Ros Eska y Biniés - ES2200027 | Habitats Directive | 385 | protected area is adjacent to site | 0 | |
| 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 | - |
Management considerations The main threats are from logging and hunting.
Protection status National None International None
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Recommended citation BirdLife International (2013) Important Bird Areas factsheet: Dos Ríos and Orba mountain ranges. Downloaded from http://www.birdlife.org on 21/05/2013
To provide new information to update this factsheet or to correct any errors, please email BirdLife
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