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Location Finland, Etelä-Suomen lääni
Central coordinates 24o 15.00' East  60o 58.00' North
IBA criteria B3, C6
Area 200 ha
Altitude 100 m
Year of IBA assessment 2000


Site description A small eutrophic lake surrounded by young deciduous forests in the heart of Häme province. The area of open water is small, with extensive marshes of Equisetum, Carex and grasses, which were harvested by local people until the 1950s, and now are encroaching on the lake. The major human activity is large-scale hunting in autumn.

Key Biodiversity One of the best breeding areas for Porzana porzana in Finland. Species of global conservation concern that do not meet IBA criteria: Crex crex (1-5 pairs, breeding).

Populations of IBA trigger species

Species Season Period Population estimate Quality of estimate IBA Criteria IUCN Category
Spotted Crake Porzana porzana breeding  1996  11-50 breeding pairs  medium  B3, C6  Least Concern 

IBA Monitoring

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

Human intrusions and disturbance recreational activities happening now some of area/population (10-49%) no or imperceptible deterioration low
Pollution agricultural & forestry effluents - type unknown/unrecorded happening now majority/most of area/population (50-90%) slow but significant deterioration high

Porzana porzana Spotted Crake 20 1 breeding pairs 5 very unfavourable

Whole area of site (>90%) covered by appropriate conservation designation  A management plan exists but it is out of date or not comprehensive  Very little or no conservation action taking place  low 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)  
Koijärven luonnonsuojelualueet 1 Private Nature Reserve 4 protected area contained by site 41  


IUCN habitat Habitat detail Extent (% of site)
Wetlands (inland) Standing freshwater; Water fringe vegetation  100%

Land use

Land-use Extent (% of site)
hunting -

Protection status National Partial International High41 ha of IBA covered by Protected Area on Private Land (Koijärvi, 41 ha). 186 ha of IBA covered by Special Protection Area (Koijärvi).

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Recommended citation  BirdLife International (2016) Important Bird and Biodiversity Area factsheet: Koijärvi lake. Downloaded from on 24/10/2016

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