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Location Spain, Castilla-La Mancha
Central coordinates 4o 20.00' West  39o 48.00' North
IBA criteria C6
Area 3,800 ha
Altitude 400 - 569m
Year of IBA assessment 2000


Site description An irrigation reservoir with steep banks on the River Tajo. There are areas of marshland and alluvial woodland.

Key Biodiversity This is an important site for breeding and wintering waterbirds, particularly wintering Phalacrocorax carbo.

Populations of IBA trigger species

Species Season Period Population estimate Quality of estimate IBA Criteria IUCN Category
Ixobrychus minutus breeding  1996  4 breeding pairs  good  C6  Not Recognised 
Black-crowned Night-heron Nycticorax nycticorax breeding  1995  18 breeding pairs  good  C6  Least Concern 
Purple Heron Ardea purpurea breeding  1995  13 breeding pairs  good  C6  Least Concern 
Western Marsh-harrier Circus aeruginosus breeding  1997  13-15 breeding pairs  medium  C6  Least Concern 
Purple Swamphen Porphyrio porphyrio resident  1995  20 breeding pairs  good  C6  Least Concern 


IUCN habitat Habitat detail Extent (% of site)
Forest Alluvial and very wet forest; Broadleaved evergreen woodland  26%
Grassland   -
Wetlands (inland) Rivers and streams; Standing freshwater; Water fringe vegetation  26%
Artificial - terrestrial Arable land; Perennial crops, orchards and groves  -

Land use

Land-use Extent (% of site)
agriculture -
tourism/recreation -
water management 26%

Protection status National None International Partial1,200 ha of IBA covered by Special Protection Area (Río Tajo en Castrejon, Islas de Malpica del Tajo y Azután, 1,960 ha).

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Recommended citation  BirdLife International (2016) Important Bird and Biodiversity Area factsheet: Castrejón reservoir. Downloaded from on 26/10/2016

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