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Location Denmark, Frederiksborg Amtskommune
Central coordinates 12o 5.00' East  55o 45.00' North
IBA criteria A4i, A4iii, B1i, B2, B3, C2, C3, C4, C6
Area 13,180 ha
Altitude 0 - 20m
Year of IBA assessment 2000

Dansk Ornitologisk Forening

Site description A long shallow fjord with islands and islets. Coastal areas have saltmarshes, agricultural land and forested peninsulas. The Fagus/Quercus forest on Bognæs includes areas of old-growth forest.

Key Biodiversity This is a very important site for wintering Cygnus olor, Aythya fuligula, Mergus merganser and Fulica atra. Winter visitors can exceed 20,000 individuals, but numbers fluctuate widely in relation to winter harshness. Circus aeruginosus, Recurvirostra avosetta, Sterna hirundo, S. paradisaea and S. albifrons, listed on Annex I of the EC Birds Directive, breed at the site. Species of global conservation concern that do not meet IBA criteria: Haliaeetus albicilla (max. 7, wintering).

Populations of IBA trigger species

Species Season Period Population estimate Quality of estimate IBA Criteria IUCN Category
Mute Swan Cygnus olor winter  1994  7,155 individuals  A4i, B1i, C3  Least Concern 
Whooper Swan Cygnus cygnus winter  1994  306 individuals  B1i, C2  Least Concern 
Tundra Swan Cygnus columbianus passage  1993  300 individuals  A4i, B1i, C2  Least Concern 
Tufted Duck Aythya fuligula winter  1995  57,000 individuals  A4i, B1i, C3  Least Concern 
Goosander Mergus merganser winter  1994  3,700 individuals  A4i, B1i, C3  Least Concern 
Common Coot Fulica atra winter  1994  19,271 individuals  B1i, C3  Least Concern 
Pied Avocet Recurvirostra avosetta breeding  1994  109 breeding pairs  good  B3  Least Concern 
Mew Gull Larus canus breeding  1996  1,731-2,277 breeding pairs  good  B2  Least Concern 
Common Tern Sterna hirundo breeding  1994  363 breeding pairs  good  C6  Least Concern 
Arctic Tern Sterna paradisaea breeding  1994  301 breeding pairs  good  C6  Least Concern 
A4iii Species group - waterbirds winter  1994  50,000-99,999 individuals  unknown  A4iii, C4   

IBA Monitoring

2010 not assessed very unfavourable not assessed
Good - based on reliable and complete / representative data

Bucephala clangula Common Goldeneye 10799 2700 individuals 26 very unfavourable
Haliaeetus albicilla White-tailed Sea-eagle 1 1 breeding pairs 100 favourable
Fulica atra Common Coot 25000 10050 individuals 41 unfavourable
Larus ridibundus Black-headed Gull 5157 4000 individuals 78 near favourable

Protected areas

Protected area Designation Area (ha) Relationship with IBA Overlap with IBA (ha)  
Roskilde Fjord Game Reserve 0 protected area contained by site 4,285  


IUCN habitat Habitat detail Extent (% of site)
Forest   5%
Coastline Salt marshes  5%
Sea Sea inlets and coastal features  80%
Artificial - terrestrial Arable land  10%

Land use

Land-use Extent (% of site)
unknown -

Protection status National Partial International High13,180 ha of IBA covered by Special Protection Area (Roskilde Fjord, Kattinge Vig and Lake, 13,180 ha).

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Recommended citation  BirdLife International (2016) Important Bird and Biodiversity Area factsheet: Roskilde Fjord, Selsø and Kattinge Søerne. Downloaded from on 24/10/2016

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