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Location Netherlands, Zeeland,Zuid-Holland
Central coordinates 3o 35.00' East  51o 43.00' North
IBA criteria A4i, A4iii, B1i, B2, C3, C4
Area 107,000 ha
Year of IBA assessment 2000

Vogelbescherming Nederland

Site description An extensive area of coastal waters of the North Sea, extending from Rotterdam in the north up to the Westerschelde estuary (032) in the south. The site also adjoins the closed-off delta area of the Rhine/Maas river system, which includes seven other IBAs (021-024, 027-029), and is close to Vlaamse Banken in Belgium. Important habitats include shallowly submerged sandbanks and intertidal mud- and sandflats. This site, together with sites 022 and 023, formed part of a single, larger site (former site NL046) in the previous pan-European IBA inventory (Grimmett and Jones 1989).

Key Biodiversity In winter this area holds fluctuating numbers of Aythya marila (max. 5,550, 1992/93), Somateria mollissima (max. 9,968, 1992/93) and Melanitta nigra (max. 20,000, 1986/87). The mean total of waterbirds in February (1992/93-1994/95) exceeds 20,000.

Populations of IBA trigger species

Species Season Period Population estimate Quality of estimate IBA Criteria IUCN Category
Greater Scaup Aythya marila winter  1991-1995  3,460 individuals  good  A4i, B1i, B2, C3  Least Concern 
A4iii Species group - waterbirds unknown  20,000 individuals  unknown  A4iii, C4   

Protected areas

Protected area Designation Area (ha) Relationship with IBA Overlap with IBA (ha)  
Voordelta Wetlands of International Importance (Ramsar) 90,000 protected area overlaps with site 90,000  


IUCN habitat Habitat detail Extent (% of site)
Sea Open Sea  96%

Land use

Land-use Extent (% of site)
fisheries/aquaculture 96%
tourism/recreation 22%
urban/industrial/transport 5%
military 30%

Protection status National None International Low395 ha of IBA covered by Special Protection Area (Kwade Hoek, 825 ha).

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Recommended citation  BirdLife International (2016) Important Bird and Biodiversity Area factsheet: Voordelta. Downloaded from on 23/10/2016

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