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Location Finland, Etelä-Suomen lääni
Central coordinates 25o 40.00' East  60o 10.00' North
IBA criteria A4i, B1i, B1ii, B2, C2, C6
Area 22,570 ha
Year of IBA assessment 2000


Site description A large offshore archipelago in the middle part of the Gulf of Finland. The area holds many islands with rocky or stony shores. The largest of the islands are forested, with areas of meadows and Juniperus stands.

Key Biodiversity An important breeding area for archipelagic avifauna, especially for Sterna caspia.

Populations of IBA trigger species

Species Season Period Population estimate Quality of estimate IBA Criteria IUCN Category
Caspian Tern Hydroprogne caspia breeding  1997  53 breeding pairs  good  A4i, B1i, B2, C2, C6  Least Concern 
Black Guillemot Cepphus grylle breeding  1997  224-229 breeding pairs  good  B1ii, B2  Least Concern 

IBA Monitoring

2010 medium favourable medium
Good - based on reliable and complete / representative data

Human intrusions and disturbance recreational activities likely in short term (within 4 years) some of area/population (10-49%) slow but significant deterioration medium
Invasive & other problematic species, genes & diseases invasive non-native/alien species/diseases - unspecified species happening now some of area/population (10-49%) no or imperceptible deterioration low

Hydroprogne caspia Caspian Tern 80 80 breeding pairs 100 favourable
Cepphus grylle Black Guillemot 225 225 breeding pairs 100 favourable

Most of site (50-90%) covered (including the most critical parts for important bird species)  No management plan exists but the management planning process has begun  The conservation measures needed for the site are being comprehensively and effectively implemented  medium 

Protected areas

Protected area Designation Area (ha) Relationship with IBA Overlap with IBA (ha)  
Saaria ja luotoja (Långören) State Nature Reserve 26 protected area contained by site 8,338  
Söderskär and Långören Archipelago Wetlands of International Importance (Ramsar) 20,483 protected area overlaps with site 11,522  
Söderskärin luonnonsuojelualue Private Nature Reserve 2,109 protected area contained by site 2,134  


IUCN habitat Habitat detail Extent (% of site)
Forest   -
Sea   -
Coastline   -

Land use

Land-use Extent (% of site)
unknown -

Protection status National Partial International Partial2,134 ha of IBA covered by Protected Area on Private Land (Söderskär, 2,134 ha). 8,338 ha of IBA covered by Specific Protection Area (Långören, 8,338 ha). 10,552 ha of IBA covered by Ramsar Site (Söderskär and Långören, 10,552 ha). 13,061 ha of IBA covered by Special Protection Area (Söderskäin ja Låhgörenin saaristo).

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Recommended citation  BirdLife International (2016) Important Bird and Biodiversity Area factsheet: Porvoo outer archipelago. Downloaded from on 20/10/2016

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