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Location Denmark
Central coordinates 9o 0.00' East  57o 40.00' North
IBA criteria A4i, A4ii, A4iii, B1i, B1ii, C3, C4
Area 1,600,000 ha
Year of IBA assessment 2000

Dansk Ornitologisk Forening

Site description A sea area with complex salinity gradients. 33% of the area is within Danish territory (the area given here), 61% in Norwegian territory and 7% in Swedish. Coordinates are approximate.

Key Biodiversity Of very high importance for pelagic species such as Sula bassana, Stercorarius skua (nearly 12% of the biogeographic population), Uria aalge, Alca torda and Alle alle (25% of the biogeographic population). Outside of the IBA, in the adjacent area of Jammerbugten, Melanitta nigra occurs in high numbers (up to 50,000) in some years.

Populations of IBA trigger species

Species Season Period Population estimate Quality of estimate IBA Criteria IUCN Category
Northern Gannet Morus bassanus winter  1993  14,000 individuals  A4ii, B1ii, C3  Least Concern 
Larus argentatus winter  1993  32,000 individuals  A4i, B1i  Not Recognised 
Great Skua Catharacta skua passage  1993  3,300 individuals  A4ii, B1ii, C3  Least Concern 
Little Auk Alle alle winter  1993  705,000 individuals  A4ii, B1ii, C3  Least Concern 
Common Murre Uria aalge non-breeding  1993  46,300 individuals  A4ii, B1ii, C3  Least Concern 
Razorbill Alca torda winter  1993  45,000 individuals  A4ii, B1ii, C3  Near Threatened 
A4iii Species group - seabirds winter  1993  500,000-999,999 individuals  unknown  A4iii, C4   
A4iii Species group - waterbirds winter  1993  20,000-49,999 individuals  unknown  A4iii, C4   

IBA Monitoring

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

Morus bassanus Northern Gannet 14000 14000 individuals 100 favourable
Larus argentatus 32000 32000 individuals 100 favourable
Catharacta skua Great Skua 3300 3300 individuals 100 favourable
Alle alle Little Auk 90000 90000 individuals 100 favourable
Uria aalge Common Murre 205000 205000 individuals 100 favourable
Alca torda Razorbill 120000 120000 individuals 100 favourable


IUCN habitat Habitat detail Extent (% of site)
Sea Open Sea  100%

Land use

Land-use Extent (% of site)
unknown -

Protection status National None International None

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Recommended citation  BirdLife International (2016) Important Bird and Biodiversity Area factsheet: Skagerrak-Southwest Norwegian trench. Downloaded from on 24/10/2016

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