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Location Spain, Castilla y León
Central coordinates 4o 32.00' West  40o 22.00' North
IBA criteria A1, A4ii, B1iii, B2, C1, C2, C6
Area 8,440 ha
Altitude 850 - 1,959m
Year of IBA assessment 2000


Site description A mountain valley with numerous gorges and streams. The dominant vegetation is scrub and Pinus forest with small areas of Quercus and Castanea woodland and riverine forest. The main human activities are forestry, hunting and livestock-farming.

Key Biodiversity An important area for resident raptors. Species of global conservation concern that do not meet IBA criteria: Aquila adalberti (resident).

Populations of IBA trigger species

Species Season Period Population estimate Quality of estimate IBA Criteria IUCN Category
Cinereous Vulture Aegypius monachus resident  1996  90 breeding pairs  good  A1, A4ii, B1iii, B2, C1, C2, C6  Near Threatened 

IBA Monitoring

2007 very high not assessed high
Good - based on reliable and complete / representative data

Human intrusions and disturbance recreational activities happening now majority/most of area/population (50-90%) moderate to rapid deterioration high
Invasive & other problematic species, genes & diseases problematic native species/diseases - named species happening now some of area/population (10-49%) slow but significant deterioration medium
Natural system modifications fire & fire suppression - increase in fire frequency/intensity likely in short term (within 4 years) whole area/population (>90%) very rapid to severe deterioration very high
Pollution excess energy - noise pollution happening now some of area/population (10-49%) moderate to rapid deterioration high
Pollution garbage & solid waste happening now some of area/population (10-49%) slow but significant deterioration medium
Residential and commercial development tourism and recreation areas likely in long term (beyond 4 years) some of area/population (10-49%) moderate to rapid deterioration medium

Forest   0 0 good (> 90%) good (> 90%) favourable

Aegypius monachus Cinereous Vulture 90 90 breeding pairs 100 favourable

Whole area of site (>90%) covered by appropriate conservation designation  A comprehensive and appropriate management plan exists that aims to maintain or improve the populations of qualifying bird species  The conservation measures needed for the site are being comprehensively and effectively implemented  high 


IUCN habitat Habitat detail Extent (% of site)
Forest Alluvial and very wet forest; Broadleaved deciduous woodland; Broadleaved evergreen woodland; Mixed woodland; Native coniferous woodland  50%
Shrubland Scrub  40%
Grassland Alpine, subalpine and boreal grassland  10%
Rocky areas Scree & boulders  -
Artificial - terrestrial Forestry plantations  -

Land use

Land-use Extent (% of site)
agriculture 10%
forestry 80%
hunting -
tourism/recreation -

Protection status National High International High8,440 ha of IBA covered by Natural Reserve (Valle de Iruelas, 8,440 ha). 8,440 ha of IBA covered by Special Protection Area (Valle de Iruelas, 8,440 ha).

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Recommended citation  BirdLife International (2016) Important Bird and Biodiversity Area factsheet: Iruelas valley. Downloaded from on 24/10/2016

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