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Location Netherlands, Overijssel
Central coordinates 6o 3.00' East  52o 42.00' North
IBA criteria B1i, B2, C2, C3, C6
Area 9,400 ha
Year of IBA assessment 2000

Vogelbescherming Nederland

Site description An area of shallow lakes and canals (former peat-workings) with fens, reedbeds, swampy woodland and wet meadows, located to the north of the city of Zwolle. The IBA is adjacent to De Weerribben (064), with which it formed a single site (`De Wieden and De Weerribben', the former site NL027) in the previous pan-European IBA inventory (Grimmett and Jones 1989). Human activities include water-sports, tourism and reed-harvesting (`Other' land-use, below).

Key Biodiversity A roost for geese Anser from surrounding feeding areas, but no counts are available.

Populations of IBA trigger species

Species Season Period Population estimate Quality of estimate IBA Criteria IUCN Category
Great Cormorant Phalacrocorax carbo breeding  1987-1991  864 breeding pairs  good  B1i, C3  Least Concern 
Spotted Crake Porzana porzana breeding  1995  5 breeding pairs  good  C6  Least Concern 
Black Tern Chlidonias niger breeding  1983-1984  128 breeding pairs  medium  B2, C2, C6  Least Concern 

Protected areas

Protected area Designation Area (ha) Relationship with IBA Overlap with IBA (ha)  
De Wieden Nature Reserve with Management Subsidy 4,216 protected area contained by site 4,991  
De Wieden Wetlands of International Importance (Ramsar) 9,400 protected area overlaps with site 9,400  
De Wieden II Nature Reserve 285 protected area contained by site 285  


IUCN habitat Habitat detail Extent (% of site)
Forest Alluvial and very wet forest  12%
Wetlands (inland) Standing freshwater; Water fringe vegetation  73%
Artificial - terrestrial Highly improved re-seeded landscapes  14%

Land use

Land-use Extent (% of site)
agriculture 10%
other 9%
fisheries/aquaculture 44%
water management 100%
nature conservation and research 62%
tourism/recreation 90%

Protection status National Partial International None4,991 ha of IBA covered by Nature Reserve (De Wieden, 4,991 ha). 285 ha of IBA covered by Nature Reserve (De Wieden II, 285 ha).

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Recommended citation  BirdLife International (2016) Important Bird and Biodiversity Area factsheet: De Wieden. Downloaded from on 26/10/2016

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