|Central coordinates||3o 35.00' East 51o 43.00' North|
|IBA criteria||A4i, A4iii, B1i, B2, C3, C4|
|Year of IBA assessment||2000|
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.
|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 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)|
|Land-use||Extent (% of site)|
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 http://www.birdlife.org on 01/07/2016
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