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Location Spain, País Vasco
Central coordinates 1o 47.00' West  43o 22.00' North
IBA criteria A1, A4i, A4ii, B1i, B1ii, B2, C1, C2, C3
Area 525 ha
Altitude 0 - 50m
Year of IBA assessment 2007


Site description A highly developed estuary on the Atlantic border between Spain and France. The site includes sandy beaches, cliffs, large areas of intertidal mud, grasslands, reedbeds (Phragmites) and some riverine woodland. Main human activities are agriculture, fisheries, tourism and industry.

Key Biodiversity A very important area for passage and wintering seabirds and waders.

Populations of IBA trigger species

Species Season Period Population estimate Quality of estimate IBA Criteria IUCN Category
Balearic Shearwater Puffinus mauretanicus passage  1996  300-2,000 individuals  medium  A1, A4ii, B1ii, C1, C2  Critically Endangered 
Black Stork Ciconia nigra passage  1996  1-11 individuals  medium  B1i, C2  Least Concern 
Eurasian Spoonbill Platalea leucorodia passage  1996  69-255 individuals  good  A4i, B1i, C2  Least Concern 
Eurasian Curlew Numenius arquata winter  1997  32-5,000 individuals  good  A4i, B1i, B2, C3  Near Threatened 
Larus cachinnans passage  1996  900-5,000 individuals  medium  A4i, B1i, C3  Not Recognised 
Sandwich Tern Thalasseus sandvicensis passage  1987  1,100-1,500 individuals  medium  B1i, C2  Least Concern 
Common Tern Sterna hirundo passage  1996  200-2,000 individuals  medium  B1i, C2  Least Concern 
Aquatic Warbler Acrocephalus paludicola passage  1996  9-40 individuals  medium  A1, C1  Vulnerable 


IUCN habitat Habitat detail Extent (% of site)
Forest Alluvial and very wet forest  10%
Grassland Humid grasslands  5%
Wetlands (inland) Rivers and streams; Water fringe vegetation  -
Sea Sea inlets and coastal features  20%
Coastline Mud flats & sand flats; Sand dunes & beaches; Sea cliffs and rocky shores; Tidal rivers & enclosed tidal waters  -
Artificial - terrestrial Arable land; Highly improved re-seeded landscapes; Other urban and industrial areas  25%

Land use

Land-use Extent (% of site)
agriculture 20%
fisheries/aquaculture 5%
tourism/recreation 20%
urban/industrial/transport 30%

Protection status National None International None

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Recommended citation  BirdLife International (2016) Important Bird and Biodiversity Area factsheet: Chingudi-Bidasoa estuary. Downloaded from on 28/10/2016

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