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Location Netherlands, Zeeland,Zuid-Holland
Central coordinates 4o 0.00' East  51o 45.00' North
IBA criteria A4i, A4iii, B1i, B2, B3, C2, C3, C4, C6
Area 13,900 ha
Altitude
Year of IBA assessment 2000

Vogelbescherming Nederland



Site description A former estuary, 18 km in length, which was closed from the sea in 1971. It is now a stagnant saline lake, mostly bordered by dykes with islets, sand-dunes and wet meadows. It adjoins the Voordelta (020) to the west, and Lake Volkerak (026) and Oosterschelde (028) to the east. Hunting does not include waterbirds.

Populations of IBA trigger species

Species Season Period Population estimate Quality of estimate IBA Criteria IUCN Category
Northern Pintail Anas acuta non-breeding  1991  1,635 individuals  good  B1i, C3  Least Concern 
Barnacle Goose Branta leucopsis winter  1991  11,053 individuals  good  A4i, B1i, B2, C2, C6  Least Concern 
Brent Goose Branta bernicla non-breeding  1991  3,752 individuals  good  A4i, B1i, C3  Least Concern 
Tundra Swan Cygnus columbianus winter  1991  222 individuals  good  A4i, B1i, B2, C2  Least Concern 
Common Goldeneye Bucephala clangula winter  1991  4,823 individuals  good  A4i, B1i, C3  Least Concern 
Red-breasted Merganser Mergus serrator winter  1990  3,883 individuals  good  A4i, B1i, C3  Least Concern 
Eurasian Spoonbill Platalea leucorodia non-breeding  1993  34 individuals  good  B1i, C2  Least Concern 
Great Cormorant Phalacrocorax carbo non-breeding  1990  3,013 individuals  good  B1i, C3  Least Concern 
Pied Avocet Recurvirostra avosetta breeding  1991  420 breeding pairs  good  A4i, B1i, B3, C2, C6  Least Concern 
Kentish Plover Charadrius alexandrinus breeding  1991  103 breeding pairs  good  B2  Least Concern 
Sandwich Tern Sterna sandvicensis breeding  1991  2,850 breeding pairs  good  A4i, B1i, B2, C2, C6  Least Concern 
A4iii Species group - waterbirds winter  1991  20,000 individuals  unknown  A4iii, C4   

Protected areas

Protected area Designation Area (ha) Relationship with IBA Overlap with IBA (ha)  
Grevelingen Wetlands of International Importance (Ramsar) 13,900 protected area overlaps with site 13,900  
Grevelingen - NL4000021 Habitats Directive 13,856 is identical to site 13,810  
Grevelingen - NL9802021 Birds Directive 13,831 is identical to site 13,826  

Habitats

IUCN habitat Habitat detail Extent (% of site)
Wetlands (inland) Standing brackish and salt water  80%
Artificial - terrestrial Highly improved re-seeded landscapes  20%

Land use

Land-use Extent (% of site)
fisheries/aquaculture 80%
water management 100%
hunting 20%
nature conservation and research 100%
tourism/recreation 90%
agriculture 5%

Protection status National None International None

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Recommended citation  BirdLife International (2014) Important Bird Areas factsheet: Grevelingen. Downloaded from http://www.birdlife.org on 17/04/2014

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