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Location Finland, Länsi-Suomen lääni
Central coordinates 21o 35.00' East  63o 0.00' North
IBA criteria A4i, B1i, B2, C2, C3
Area 4,570 ha
Year of IBA assessment 2000


Site description A shallow eutrophic sea bay at the mouth of the Laihia river lying south of the town of Vaasa. Most of the bay is open water, although there are wide marshes, and extensive beds of reed Phragmites. To the south lies the agricultural area of Söderfjärden, which was previously a sea bay. The IBA also includes an undisturbed area of inner archipelago, where Grus grus from the farmland roost.

Key Biodiversity The most important staging area for Grus grus in Finland. It is also important for other staging waterbirds.

Populations of IBA trigger species

Species Season Period Population estimate Quality of estimate IBA Criteria IUCN Category
Bean Goose Anser fabalis passage  1996  1,500 individuals  good  B1i, C3  Least Concern 
Greylag Goose Anser anser passage  1996  290 individuals  good  B1i, C3  Least Concern 
Whooper Swan Cygnus cygnus passage  1996  1,000 individuals  good  A4i, B1i, C2  Least Concern 
Common Crane Grus grus passage  1996  2,800 individuals  good  A4i, B1i, C2  Least Concern 
Little Gull Hydrocoloeus minutus breeding  1996  40 breeding pairs  good  B2  Least Concern 

IBA Monitoring

2010 high unfavourable low
Medium - based upon reliable but incomplete / partially representative data

Human intrusions and disturbance recreational activities happening now majority/most of area/population (50-90%) no or imperceptible deterioration low
Natural system modifications dams & water management/use - dams (size unknown) happening now some of area/population (10-49%) no or imperceptible deterioration low
Pollution agricultural & forestry effluents - type unknown/unrecorded happening now some of area/population (10-49%) moderate to rapid deterioration high

Anser fabalis Bean Goose 1500 800 individuals 54 unfavourable
Anser anser Greylag Goose 2000 4000 individuals 100 favourable
Cygnus cygnus Whooper Swan 1000 750 individuals 75 near favourable
Grus grus Common Crane 3000 6500 individuals 100 favourable

Most of site (50-90%) covered (including the most critical parts for important bird species)  A management plan exists but it is out of date or not comprehensive  Very little or no conservation action taking place  low 

Protected areas

Protected area Designation Area (ha) Relationship with IBA Overlap with IBA (ha)  
High Coast / Kvarken Archipelago World Heritage Site 336,900 protected area is adjacent to site 0  


IUCN habitat Habitat detail Extent (% of site)
Wetlands (inland) Standing freshwater  -
Artificial - terrestrial Arable land  50%
Coastline Lagoons  -

Land use

Land-use Extent (% of site)
agriculture 50%
unknown 50%

Protection status National None International High4,328 ha of IBA covered by Special Protection Area (Sundominlahti).

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Recommended citation  BirdLife International (2016) Important Bird and Biodiversity Area factsheet: Sundominlahti Bay and Söderfjärden. Downloaded from on 28/10/2016

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