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Location Netherlands, Friesland
Central coordinates 6o 5.00' East  53o 3.00' North
IBA criteria A4i, A4iii, B1i, B2, C3, C4
Area 670 ha
Year of IBA assessment 2000

Vogelbescherming Nederland

Site description Flood-plain meadows of the River Koningsdiep, situated in the eastern part of Friesland.

Key Biodiversity This is an important roost for geese Anser from surrounding feeding areas. Waterbird numbers quoted are rough estimates.

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  30,000 individuals  good  A4i, B1i, C3  Least Concern 
Barnacle Goose Branta leucopsis winter  1979-1989  1,500 individuals  good  B2  Least Concern 
Northern Shoveler Spatula clypeata non-breeding  1979-1989  400 individuals  good  B1i, C3  Least Concern 
Black-tailed Godwit Limosa limosa non-breeding  1979-1989  5,000 individuals  good  A4i, B1i, C3  Near Threatened 
A4iii Species group - waterbirds winter  1989  20,000-49,999 individuals  unknown  A4iii, C4   

Protected areas

Protected area Designation Area (ha) Relationship with IBA Overlap with IBA (ha)  
Van Oordt's Mersken Nature Reserve 388 protected area contained by site 388  


IUCN habitat Habitat detail Extent (% of site)
Wetlands (inland) Rivers and streams  -
Artificial - terrestrial Highly improved re-seeded landscapes  96%

Land use

Land-use Extent (% of site)
water management 100%
nature conservation and research 58%
urban/industrial/transport 6%
agriculture 90%
hunting 50%

Protection status National Partial International None388 ha of IBA covered by Nature Reserve (Van Oordt's Mersken, 388 ha).

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Recommended citation  BirdLife International (2016) Important Bird and Biodiversity Area factsheet: Van Oordt's Mersken. Downloaded from on 25/10/2016

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