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Location Netherlands, Friesland
Central coordinates 5o 52.00' East  53o 13.00' North
IBA criteria A4i, A4iii, B1i, B2, C2, C3, C4, C6
Area 600 ha
Altitude 0 - 1m
Year of IBA assessment 2000

Vogelbescherming Nederland

Site description A complex of freshwater lakes (resulting partly from peat diggings), reedbeds and wet meadows, located to the east of the city of Leeuwarden. Human activities include reed-harvesting (`Other' land-use, below), and the site includes two duck decoys.

Key Biodiversity An important roost for geese Anser which come from surrounding feeding areas.

Populations of IBA trigger species

Species Season Period Population estimate Quality of estimate IBA Criteria IUCN Category
Greater White-fronted Goose Anser albifrons winter  1979-1989  40,000 individuals  good  A4i, B1i, C3  Least Concern 
Barnacle Goose Branta leucopsis winter  1980-1990  4,000 individuals  good  A4i, B1i, B2, C2  Least Concern 
Eurasian Wigeon Mareca penelope winter  1980-1990  20,000 individuals  good  A4i, B1i, C3  Least Concern 
Northern Shoveler Spatula clypeata non-breeding  1979-1989  1,000 individuals  good  B1i, C3  Least Concern 
Ruff Calidris pugnax non-breeding  1979-1989  4,000 individuals  good  C6  Least Concern 
A4iii Species group - waterbirds winter  1990  50,000-99,999 individuals  unknown  A4iii, C4   

Protected areas

Protected area Designation Area (ha) Relationship with IBA Overlap with IBA (ha)  
Ryptsjerkster- en Binnemiedepolder Nature Reserve 462 protected area contained by site 462  


IUCN habitat Habitat detail Extent (% of site)
Wetlands (inland) Standing freshwater; Water fringe vegetation  40%
Artificial - terrestrial Highly improved re-seeded landscapes  60%

Land use

Land-use Extent (% of site)
agriculture 6%
other 5%
fisheries/aquaculture 10%
water management 100%
hunting 5%
nature conservation and research 85%
tourism/recreation 50%

Protection status National Partial International None462 ha of IBA covered by Nature Reserve (Ryptsjerkster- en Binnemiedepolder, 462 ha).

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Recommended citation  BirdLife International (2016) Important Bird and Biodiversity Area factsheet: Groote Wielen. Downloaded from on 25/10/2016

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