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Location Netherlands, Friesland
Central coordinates 5o 25.00' East  52o 59.00' North
IBA criteria A4i, A4iii, B1i, C2, C3, C4, C6
Area 1,320 ha
Year of IBA assessment 2000

Vogelbescherming Nederland

Site description An area of shallow waters, wet meadows and (landward of the dyke) improved grassland along the Frisian west coast. It is a subsite of Lake IJsselmeer (034), and lies adjacent to the Makkumer- and Kooiwaard (035) in the north. This site, together with site 035, formed part of a single, larger site (former site NL016) in the previous pan-European IBA inventory (Grimmett and Jones 1989).

Key Biodiversity Non-breeding numbers are based on aerial counts which tend to underestimate species with a scattered occurrence. The site is an important roost for geese and waders, but actual roosting numbers are poorly reflected by counts. The average seasonal peak number of waterbirds during 1992-1996 exceeded 20,000.

Populations of IBA trigger species

Species Season Period Population estimate Quality of estimate IBA Criteria IUCN Category
Pied Avocet Recurvirostra avosetta non-breeding  1988  1,500 individuals  poor  A4i, B1i, C2  Least Concern 
Black-tailed Godwit Limosa limosa non-breeding  1985-1986  9,000 individuals  medium  A4i, B1i, C3  Near Threatened 
Ruff Calidris pugnax breeding  1988-1991  13 breeding pairs  good  C6  Least Concern 
Ruff Calidris pugnax non-breeding  1986  7,000 individuals  poor  C6  Least Concern 
Common Tern Sterna hirundo breeding  1987-1991  1,680 breeding pairs  good  C2, C6  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)  
Friese IJsselmeerkust I Natural Monument 4,800 protected area overlaps with site 550  
Friese IJsselmeerkust II Natural Monument 120 protected area overlaps with site 2  
Workumerwaard Wetlands of International Importance (Ramsar) 0 protected area overlaps with site 0  


IUCN habitat Habitat detail Extent (% of site)
Wetlands (inland) Standing freshwater  39%
Artificial - terrestrial Highly improved re-seeded landscapes  61%

Land use

Land-use Extent (% of site)
agriculture 35%
other 5%
fisheries/aquaculture 39%
water management 100%
nature conservation and research 36%
tourism/recreation 54%

Protection status National Partial International Partial550 ha of IBA covered by Natural Monument (Friese IJsselmeerkust I, 4,800 ha). 2 ha of IBA covered by Natural Monument (Friese IJsselmeerkust II, 120 ha). 550 ha of IBA covered by Special Protection Area (Friese IJsselmeerkust, 5,130 ha).

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Recommended citation  BirdLife International (2016) Important Bird and Biodiversity Area factsheet: Workumerwaard. Downloaded from on 27/10/2016

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