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Location Finland, Etelä-Suomen lääni
Central coordinates 29o 32.00' East  61o 32.00' North
IBA criteria B1i, B2, B3, C2, C6
Area 519 ha
Altitude 70 m
Year of IBA assessment 2000


Site description Siikalahti Bay, one of the most famous wetlands in Finland, is a sheltered, shallow bay of Simpele lake. It is heavily vegetated with Phragmites, Typha and floating plants like Nymphaea, with open water constituting no more than 25% of the lake area. Eutrophication is mostly due to the input of large amounts of nutrient run-off from adjacent farmlands and sewage disposal from nearby settlements. Sammallampi lake, connected to Siikalahti Bay via the Simpele lake water system, is a small eutrophic lake surrounded by farmlands and forests. The vegetation is similar to Siikalahti, but overgrowth does not pose a significant threat in the near future.

Populations of IBA trigger species

Species Season Period Population estimate Quality of estimate IBA Criteria IUCN Category
Whooper Swan Cygnus cygnus passage  1996  101-500 individuals  medium  B1i, C2  Least Concern 
Eurasian Bittern Botaurus stellaris breeding  1996  10-11 breeding pairs  good  B2, C6  Least Concern 
Spotted Crake Porzana porzana breeding  1996  45-70 breeding pairs  good  B3, C6  Least Concern 
Common Crane Grus grus passage  1996  101-500 individuals  medium  B1i, C2  Least Concern 

Protected areas

Protected area Designation Area (ha) Relationship with IBA Overlap with IBA (ha)  
Siikalahti - FI0415007 Habitats Directive 465 protected area overlaps with site 364  
Siikalahti, Sammallampi, Rautalahti - FI0415001 Birds Directive 682 protected area overlaps with site 420  


IUCN habitat Habitat detail Extent (% of site)
Forest Broadleaved deciduous woodland; Mixed woodland  15%
Grassland Alpine, subalpine and boreal grassland  5%
Wetlands (inland) Standing freshwater  75%
Unknown   5%

Land use

Land-use Extent (% of site)
hunting 15%
tourism/recreation 15%
not utilised 50%
unknown 20%

Protection status National None International High512 ha of IBA covered by three Special Protection Areas (Siikalahti, Sammallampi, and Rautalahti).

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Recommended citation  BirdLife International (2014) Important Bird Areas factsheet: Siikalahti bay and Sammallampi lake. Downloaded from on 16/09/2014

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