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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.

Key Biodiversity Very important for wetland breeding birds. Species of global conservation concern that do not meet IBA criteria: Anser erythropus (max. 1, passage), Crex crex (1 pair, breeding).

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 

IBA Monitoring

2010 high very unfavourable high
Good - based on reliable and complete / representative data

Natural system modifications dams & water management/use - dams (size unknown) happening now some of area/population (10-49%) slow but significant deterioration medium
Pollution agricultural & forestry effluents - type unknown/unrecorded happening now majority/most of area/population (50-90%) slow but significant deterioration high

Botaurus stellaris Eurasian Bittern 10 9 breeding pairs 90 near favourable
Porzana porzana Spotted Crake 30 10 breeding pairs 34 very unfavourable

Whole area of site (>90%) covered by appropriate conservation designation  A comprehensive and appropriate management plan exists that aims to maintain or improve the populations of qualifying bird species  The conservation measures needed for the site are being comprehensively and effectively implemented  high 


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 (2016) Important Bird and Biodiversity Area factsheet: Siikalahti bay and Sammallampi lake. Downloaded from on 28/10/2016

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