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Location Denmark, Vestsjællands Amtskommune
Central coordinates 11o 0.00' East  55o 20.00' North
IBA criteria A4i, A4iii, B1i, C3, C4
Area 4,920 ha
Altitude 0 - 24m
Year of IBA assessment 2000

Dansk Ornitologisk Forening

Site description The small island of Sprogø.

Key Biodiversity Numbers of Somateria mollissima have now recovered after decreases caused by siltation from the construction of the Great Belt Bridge. Sterna sandvicensis, listed on Annex I of the EC Birds Directive, bred at the site in 1983, but almost all breeding gulls and terns have been displaced from the site as a result of the bridge construction work.

Populations of IBA trigger species

Species Season Period Population estimate Quality of estimate IBA Criteria IUCN Category
Common Eider Somateria mollissima resident  1989  51,000 breeding pairs  A4i, B1i, C3  Near Threatened 
A4iii Species group - waterbirds breeding  1989  100,000-499,999 individuals  unknown  A4iii, C4   

IBA Monitoring

2009 not assessed very unfavourable not assessed
Good - based on reliable and complete / representative data

Somateria mollissima Common Eider 51000 3000 individuals 6 very unfavourable
Thalasseus sandvicensis Sandwich Tern 360 360 breeding pairs 100 favourable

Protected areas

Protected area Designation Area (ha) Relationship with IBA Overlap with IBA (ha)  
Sprog Baltic Sea Protected Area (Helcom) 4,932 protected area overlaps with site 4,806  
Sprog Baltic Sea Protected Area (Helcom) 37,429 protected area overlaps with site 4,806  


IUCN habitat Habitat detail Extent (% of site)
Coastline Salt marshes  20%
Artificial - terrestrial Other urban and industrial areas  80%

Land use

Land-use Extent (% of site)
urban/industrial/transport 80%
nature conservation and research 20%

Protection status National Partial International High4,920 ha of IBA covered by Special Protection Area (Sprogø and Halskov Rev, 4,920 ha).

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Recommended citation  BirdLife International (2016) Important Bird and Biodiversity Area factsheet: Sprogø and Halsskov Rev. Downloaded from on 28/10/2016

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