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Location France, Basse-Normandie
Central coordinates 1o 48.00' West  48o 54.00' North
IBA criteria A4i, B1i, B3, C2, C6
Area 278,236 ha
Altitude 5 - 15m
Year of IBA assessment 2000

Ligue Pour La Protection des Oiseaux

Site description Islands in the Baie du Mont-St-Michel with rocky coasts, sand and shingle-beaches, scrub, grassland and arable land.

Key Biodiversity The site is important for breeding seabirds.

Populations of IBA trigger species

Species Season Period Population estimate Quality of estimate IBA Criteria IUCN Category
European Storm-petrel Hydrobates pelagicus breeding  1991  1-10 breeding pairs  C6  Least Concern 
European Shag Phalacrocorax aristotelis breeding  1991  525 breeding pairs  B3  Least Concern 
Great Black-backed Gull Larus marinus breeding  1991  350 breeding pairs  B3  Least Concern 
Sandwich Tern Thalasseus sandvicensis passage  1991  750-5,000 individuals  A4i, B1i, C2  Least Concern 
Common Tern Sterna hirundo breeding  1991  20-25 breeding pairs  C6  Least Concern 
Dartford Warbler Sylvia undata breeding  1991  1-10 breeding pairs  C6  Near Threatened 

Protected areas

Protected area Designation Area (ha) Relationship with IBA Overlap with IBA (ha)  
Chausey - FR2500079 Habitats Directive 82,943 protected area contains site 18,400  
Chausey - FR2510037 Birds Directive 82,426 protected area contains site 71,750  
FR038 Private Reserve 90 protected area contained by site 90  
Iles Chausey National Marine Hunting Reserve 54 protected area contained by site 54  
Iles Chausey Maritime Hunting Reserve 18,000 protected area contained by site 18,000  


IUCN habitat Habitat detail Extent (% of site)
Shrubland Heathland  -
Sea Open Sea  -
Coastline Mud flats & sand flats; Rock stacks and islets; Sand dunes & beaches; Shingle & stony beaches  -
Artificial - terrestrial Arable land  -

Land use

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

Protection status National High International High18,054 ha of IBA covered by Hunting Reserve (Iles Chausey Maritime, 18,000 ha). 54 ha of IBA covered by Hunting Reserve (Iles Chausey terrestre, 54 ha). 90 ha of IBA covered by Private Reserve (90 ha). 18,000 ha of IBA covered by Special Protection Area (Iles Chausey, 18,000 ha).

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Recommended citation  BirdLife International (2015) Important Bird Areas factsheet: Iles Chausey. Downloaded from on 18/04/2015

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