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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.

Key Biodiversity An important area for island-breeding species, most significantly Alca torda and Cepphus grylle, but also Somateria mollissima (2,000-5,000 pairs), Arenaria interpres (50-100 pairs) and Larus fuscus fuscus (50-100 pairs).

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  Near Threatened 
Black Guillemot Cepphus grylle breeding  1997  1,001-2,000 breeding pairs  medium  B1ii, B2  Least Concern 

IBA Monitoring

2010 low near favourable negligible
Medium - based upon reliable but incomplete / partially representative data

Human intrusions and disturbance recreational activities happening now small area/few individuals (<10%) no or imperceptible deterioration low

Larus marinus Great Black-backed Gull 50 60 breeding pairs 100 favourable
Hydroprogne caspia Caspian Tern 100 85 breeding pairs 85 near favourable
Alca torda Razorbill 1700 1700 breeding pairs 100 favourable
Cepphus grylle Black Guillemot 1000 1100 breeding pairs 100 favourable

Unknown  No management planning has taken place  Very little or no conservation action taking place  negligible 

Protected areas

Protected area Designation Area (ha) Relationship with IBA Overlap with IBA (ha)  
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 (2016) Important Bird and Biodiversity Area factsheet: Eckerö and Hammarland archipelago. Downloaded from on 24/10/2016

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