email a friend
printable version
Location Finland, Länsi-Suomen lääni
Central coordinates 21o 30.00' East  59o 48.00' North
IBA criteria A4i, A4iii, B1i, B1ii, B2, B3, C3, C4
Area 73,500 ha
Year of IBA assessment 2000


Site description A very large area of outer archipelago inside the Saaristomeri National Park: the site's boundaries have been drawn to include the most ornithologically important parts of the park. Large areas of open water dominate the landscape, although the numerous islands are also impressive. Most of the islands are small, stony and treeless with steep shores. Jurmo, the largest, is ornithologically the most diverse and important, supporting long stony or sandy ridges and large, open areas of treeless heath. Boating and other human activities are much scarcer than within the inner archipelago.

Key Biodiversity An exceptionally important breeding area for archipelagic avifauna, with total numbers exceeding 20,000 pairs. Also nationally important as a staging area for waterbirds.

Populations of IBA trigger species

Species Season Period Population estimate Quality of estimate IBA Criteria IUCN Category
Common Eider Somateria mollissima breeding  1995  11,500 breeding pairs  good  A4i, B1i, C3  Near Threatened 
Great Black-backed Gull Larus marinus breeding  1995  170-190 breeding pairs  good  B3  Least Concern 
Razorbill Alca torda breeding  1995  200-220 breeding pairs  good  B1ii, C3  Near Threatened 
Black Guillemot Cepphus grylle breeding  1995  130-150 breeding pairs  good  B1ii, B2  Least Concern 
A4iii Species group - waterbirds breeding  1995  20,000-49,999 individuals  unknown  A4iii, C4   

IBA Monitoring

2010 high unfavourable low
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
Invasive & other problematic species, genes & diseases invasive non-native/alien species/diseases - named species happening now some of area/population (10-49%) slow but significant deterioration medium
Invasive & other problematic species, genes & diseases problematic native species/diseases - named species happening now small area/few individuals (<10%) no or imperceptible deterioration low
Pollution agricultural & forestry effluents - nutrient loads happening now whole area/population (>90%) slow but significant deterioration high

Somateria mollissima Common Eider 11500 7000 breeding pairs 61 unfavourable
Larus marinus Great Black-backed Gull 170 150 breeding pairs 89 not assessed
Alca torda Razorbill 200 230 breeding pairs 100 favourable
Cepphus grylle Black Guillemot 200 200 breeding pairs 100 favourable

Some of site covered (10-49%)  A management plan exists but it is out of date or not comprehensive  Some limited conservation initiatives are in place  low 

Protected areas

Protected area Designation Area (ha) Relationship with IBA Overlap with IBA (ha)  
Archipelago Sea Area UNESCO-MAB Biosphere Reserve 4,200,000 protected area contains site 73,500  
Korppoo and Nauvo southern archipelago Baltic Sea Protected Area (Helcom) 59,409 protected area overlaps with site 31,721  
Saaristomeren kansallispuisto National Park 49,988 protected area contains site 73,500  


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

Land use

Land-use Extent (% of site)
urban/industrial/transport -
tourism/recreation -

Protection status National High International High73,500 ha of IBA covered by National Park (Saaristomeri, 311,000 ha). 13,601 ha of IBA covered by two Special Protection Areas (Saaristomeri; Jurmo). 73,500 ha of IBA covered by Biosphere Reserve (Saaristomeri, 420,000 ha).

Contribute  Please click here to help BirdLife conserve the world's birds - your data for this IBA and others are vital for helping protect the environment.

Recommended citation  BirdLife International (2016) Important Bird and Biodiversity Area factsheet: Korppoo and Nauvo southern archipelago. Downloaded from on 24/10/2016

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