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Location Denmark, Fyns Amtskommune
Central coordinates 10o 50.00' East  55o 10.00' North
IBA criteria A4iii, B1i, C3, C4
Area 3,470 ha
Altitude 0 - 2m
Year of IBA assessment 2000

Dansk Ornitologisk Forening

Site description Vresen is a small islet with a little vegetation, surrounded by shallow sea areas.

Key Biodiversity This is an important site for wintering Somateria mollissima; although numbers fell in the early 1990s due to siltation of mussel banks caused by the construction of the Great Belt Bridge, numbers in the Great Belt area as a whole seem to have recovered.

Populations of IBA trigger species

Species Season Period Population estimate Quality of estimate IBA Criteria IUCN Category
Common Eider Somateria mollissima winter  1993  7,000 individuals  B1i, C3  Near Threatened 
A4iii Species group - waterbirds unknown  20,000 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 30940 7000 individuals 23 very unfavourable
Phalacrocorax carbo Great Cormorant 48 45 breeding pairs 94 favourable


IUCN habitat Habitat detail Extent (% of site)
Sea Sea inlets and coastal features  100%

Land use

Land-use Extent (% of site)
unknown 100%

Protection status National Low International High3,470 ha of IBA covered by Special Protection Area (Vresen and surrounding sea areas, 3,470 ha).

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Recommended citation  BirdLife International (2016) Important Bird and Biodiversity Area factsheet: Vresen and sea area between Fyn and Langeland. Downloaded from on 26/10/2016

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