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Location Finland, Länsi-Suomen lääni
Central coordinates 22o 34.00' East  61o 14.00' North
IBA criteria A1, B1i, C1, C2
Area 3,474 ha
Altitude 45 m
Year of IBA assessment 2000


Site description A complex of habitats, comprising the large, shallow and eutrophic Puurijärvi lake, open fields (220 ha) and several adjacent mires along the Kokemäki river. The lake is mainly bordered by forests and in summer becomes almost totally overgrown with vegetation. Isosuo and other mires are large raised bogs with extensive open areas of pools in the centre, and sparse swamp-forests or mixtures of swamps and forests at the edges.

Key Biodiversity An important staging area for Haliaeetus albicilla and Cygnus cygnus. Podiceps grisegena (20 pairs), Porzana porzana (15 pairs) and Grus grus (10 pairs) also breed. Species of global conservation concern that do not meet IBA criteria: Crex crex (max. 4 pairs, breeding).

Populations of IBA trigger species

Species Season Period Population estimate Quality of estimate IBA Criteria IUCN Category
Whooper Swan Cygnus cygnus passage  1997  400 individuals  B1i, C2  Least Concern 
White-tailed Sea-eagle Haliaeetus albicilla passage  1997  10-15 individuals  A1, C1  Least Concern 

IBA Monitoring

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

Natural system modifications dams & water management/use - dams (size unknown) happening now majority/most of area/population (50-90%) no or imperceptible deterioration low
Pollution agricultural & forestry effluents - soil erosion, sedimentation happening now majority/most of area/population (50-90%) slow but significant deterioration high

Cygnus cygnus Whooper Swan 400 400 individuals 100 favourable

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 

Protected areas

Protected area Designation Area (ha) Relationship with IBA Overlap with IBA (ha)  
Puurijärven ja Isonsuon kansallispuisto National Park 2,697 protected area contained by site 2,538  


IUCN habitat Habitat detail Extent (% of site)
Wetlands (inland) Raised bogs; Standing freshwater  91%
Artificial - terrestrial   7%

Land use

Land-use Extent (% of site)
agriculture 7%
not utilised 90%

Protection status National Partial International High2,538 ha of IBA covered by National Park (Puurijärvi-Isosuo, 2,538 ha). 3,126 ha of IBA covered by Special Protection Area (Puurijärvi-Isosuo).

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Recommended citation  BirdLife International (2016) Important Bird and Biodiversity Area factsheet: Puurijärvi-Isosuo wetlands. Downloaded from on 28/10/2016

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