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Location Netherlands, Noord-Holland
Central coordinates 4o 50.00' East  52o 31.00' North
IBA criteria A4i, B1i, C2, C3, C6
Area 1,940 ha
Year of IBA assessment 2000

Vogelbescherming Nederland

Site description A polder landscape including a shallow lake, ditches, wet meadows and marshland, situated to the north of the city of Zaandam. This site, together with sites 068, 071 and 072, formed part of a single, larger site (former site NL038) in the previous pan-European IBA inventory (Grimmett and Jones 1989).

Populations of IBA trigger species

Species Season Period Population estimate Quality of estimate IBA Criteria IUCN Category
Eurasian Wigeon Mareca penelope winter  1987-1991  17,410 individuals  good  B1i, C3  Least Concern 
Eurasian Spoonbill Platalea leucorodia non-breeding  1987-1991  38 individuals  good  B1i, C2  Least Concern 
Black-tailed Godwit Limosa limosa non-breeding  1991-1992  5,500 individuals  medium  A4i, B1i, C3  Near Threatened 
Ruff Calidris pugnax breeding  1992-1993  19 breeding pairs  medium  C6  Least Concern 

Protected areas

Protected area Designation Area (ha) Relationship with IBA Overlap with IBA (ha)  
Wormer- En Jisperveld Nature Reserve 642 protected area contained by site 642  


IUCN habitat Habitat detail Extent (% of site)
Wetlands (inland) Standing freshwater; Water fringe vegetation  17%
Artificial - terrestrial Highly improved re-seeded landscapes  83%

Land use

Land-use Extent (% of site)
agriculture 25%
fisheries/aquaculture 10%
water management 100%
hunting 10%
nature conservation and research 32%
tourism/recreation 11%

Protection status National Partial International None618 ha of IBA covered by Nature Reserve (Wormer- en Jisperveld, 618 ha).

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Recommended citation  BirdLife International (2015) Important Bird and Biodiversity Area factsheet: Wormer-and Jisperveld. Downloaded from on 28/11/2015

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