IBA Criteria

Year of most recent IBA criteria assessment: 2000

Populations of IBA trigger species
Species Current IUCN Red List Category Season Year(s) of estimate Population estimate IBA Criteria Triggered
Pied Avocet Recurvirostra avosetta LC non-breeding 1988 1,500 individuals A4i, B1i, C2
Black-tailed Godwit Limosa limosa NT non-breeding 1985-1986 9,000 individuals A4i, B1i, C3
Ruff Calidris pugnax LC breeding 1988-1991 13 breeding pairs C6
Ruff Calidris pugnax LC non-breeding 1986 7,000 individuals C6
Common Tern Sterna hirundo LC breeding 1987-1991 1,680 breeding pairs C2, C6
A4iii Species group - waterbirds n/a unknown - 20,000 individuals A4iii, C4

Note: This table presents the IBA criteria triggered and the species that triggered then at the time of assessment, the current IUCN Red List category may vary from that which was in place at that time.

For more information about the IBA assessment process and criteria please click here

IBA Protection

Protected Area Designation Area (ha) Relationship with IBA Overlap with IBA (ha)
Workumerwaard Ramsar Site, Wetland of International Importance 0 protected area overlaps with site 0
Friese IJsselmeerkust II Natural Monument 120 protected area overlaps with site 2
Friese IJsselmeerkust I Natural Monument 4,800 protected area overlaps with site 550


IUCN Habitat Habitat detail Extent (% of site)
Wetlands (inland) Standing freshwater -
Artificial/Terrestrial Highly improved re-seeded landscapes -
For further information about the habitat classification please click here.

Land use

Land-use Extent (% of site)
agriculture -
other -
fisheries/aquaculture -
water management -
nature conservation and research -
tourism/recreation -
For further information about the land use classification please click here.

Recommended citation
BirdLife International (2022) Important Bird Areas factsheet: Workumerwaard. Downloaded from on 04/10/2022.