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Location Finland, Ahvenanmaan maakunta
Central coordinates 19o 38.00' East  60o 25.00' North
IBA criteria A4i, B1i, B1ii, B2, B3, C2, C3, C6
Area 16,170 ha
Year of IBA assessment 2000


Site description An area of both outer and middle archipelago with a large number of islands, situated at the western edge of åland. Most of the islands are bare and almost treeless, but some larger ones hold small patches of forest, swamps, ponds and meadows. Signildskär, one of the largest islands, has the oldest bird observatory in Fennoscandia, founded in 1923. Migration observations have been carried out from the station, but the main activity now is ringing.

Populations of IBA trigger species

Species Season Period Population estimate Quality of estimate IBA Criteria IUCN Category
Great Black-backed Gull Larus marinus breeding  1997  51-100 breeding pairs  medium  B3  Least Concern 
Caspian Tern Hydroprogne caspia breeding  1997  101-200 breeding pairs  medium  A4i, B1i, B2, C2, C6  Least Concern 
Razorbill Alca torda breeding  1997  1,001-2,000 breeding pairs  medium  B1ii, B3, C3  Least Concern 
Black Guillemot Cepphus grylle breeding  1997  1,001-2,000 breeding pairs  medium  B1ii, B2  Least Concern 

Protected areas

Protected area Designation Area (ha) Relationship with IBA Overlap with IBA (ha)  
Läggningsbådan - FI1400048 Birds Directive 283 protected area overlaps with site 150  
Märrkallarna - Åbergsgrynnan - Mjölskärskallen - FI1400035 Habitats Directive 759 protected area overlaps with site 77  
Signilskär - Märket - FI1400047 Birds Directive 21,030 protected area overlaps with site 7,614  
Signilskär-Märket Archipelago Wetlands of International Importance (Ramsar) 22,566 protected area contains site 16,170  


IUCN habitat Habitat detail Extent (% of site)
Sea   60%
Coastline Rock stacks and islets; Sea cliffs and rocky shores  40%

Land use

Land-use Extent (% of site)
tourism/recreation 30%
unknown 10%
not utilised 60%

Protection status National None International Partial7,716 ha of IBA covered by Ramsar Site (Signilskär, 11,600 ha).

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Recommended citation  BirdLife International (2014) Important Bird Areas factsheet: Eckerö and Hammarland archipelago. Downloaded from on 20/10/2014

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