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Location Denmark, Vestsjællands Amtskommune
Central coordinates 11o 18.00' East  55o 50.00' North
IBA criteria A4i, A4iii, B1i, C3, C4
Area 40,250 ha
Altitude 0 - 30m
Year of IBA assessment 2000

Dansk Ornitologisk Forening

Site description A shallow sea bay and coastal peninsulas with saltmarshes, reedbeds, heathlands, sandy and stony beaches, clay cliffs, unimproved dry grasslands, mixed deciduous forest and small patches of botanically interesting meadow on old shell beds. The site also includes a partly cultivated island with scattered habitation.

Key Biodiversity Of high importance for wintering Somateria mollissima and Melanitta nigra, but recent quantitative data are unavailable. Sterna paradisaea, listed on Annex I of the EC Birds Directive, breeds at the site.

Populations of IBA trigger species

Species Season Period Population estimate Quality of estimate IBA Criteria IUCN Category
Common Eider Somateria mollissima winter  1989  32,900 individuals  A4i, B1i, C3  Near Threatened 
Melanitta nigra winter  1989  48,920 individuals  A4i, B1i, C3  Not Recognised 
Melanitta fusca winter  1989  7,450 individuals  A4i, B1i, C3  Not Recognised 
A4iii Species group - waterbirds unknown  1989  50,000-99,999 individuals  unknown  A4iii, C4   

IBA Monitoring

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

Phalacrocorax carbo Great Cormorant 1000 800 individuals 80 near favourable
Circus aeruginosus Western Marsh-harrier 1 1 breeding pairs 100 favourable
Recurvirostra avosetta Pied Avocet 8 8 breeding pairs 100 favourable
Recurvirostra avosetta Pied Avocet 1032 700 individuals 68 unfavourable
Larus ridibundus Black-headed Gull 4600 4600 individuals 100 favourable
Thalasseus sandvicensis Sandwich Tern 685 685 breeding pairs 100 favourable

Protected areas

Protected area Designation Area (ha) Relationship with IBA Overlap with IBA (ha)  
Sejer Baltic Sea Protected Area (Helcom) 44,461 protected area overlaps with site 39,988  
Sejeroe Bugt, Nekeseloe Bugt and Saltbaek Vig Wetlands of International Importance (Ramsar) 43,877 protected area contains site 40,250  


IUCN habitat Habitat detail Extent (% of site)
Sea Sea inlets and coastal features  95%

Land use

Land-use Extent (% of site)
agriculture 50%
nature conservation and research 50%
tourism/recreation 60%

Protection status National Low International High40,250 ha of IBA covered by Ramsar Site (Sejerø Bugt, Nekeselø Bugt and Saltbæk Vig, 42,560 ha). 40,250 ha of IBA covered by Special Protection Area (Sejrø Bugt and Nekselø, 40,250 ha).

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Recommended citation  BirdLife International (2016) Important Bird and Biodiversity Area factsheet: Sejerø Bay and Nekselø. Downloaded from on 26/10/2016

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