Köyliönjärvi and Pyhäjärvi lakes

Country/territory: Finland

IBA Criteria met: A1, A4i, B1i, C1, C2, C3 (2000)
For more information about IBA criteria please click here

Area: 2,759 ha

Most recent IBA monitoring assessment
Year of assessment Threat score (pressure) Condition score (state) Action score (response)
2010 high unfavourable low
For more information about IBA monitoring please click here

Site description
Two adjacent large lakes lying south-east of Eura. Köyliönjärvi lake is 10 km long, eutrophic and surrounded by farmland and settlements. Several large ridge-like islands with mixed habitats stand in the middle of the lake. Cattle graze some parts of the shoreline keeping meadow vegetation low and deciduous forests open. The IBA also includes some of the most ornithologically important bays of Pyhäjärvi lake, which is otherwise nutrient-poor, (oligotrophic) and unimportant for birds.

Key biodiversity
One of the most important staging areas for Mergus merganser (in autumn) in Finland. Species of global conservation concern that do not meet IBA criteria: Haliaeetus albicilla (5 individuals, passage), Crex crex (1 pair, breeding).

Recommended citation
BirdLife International (2021) Important Bird Areas factsheet: Köyliönjärvi and Pyhäjärvi lakes. Downloaded from on 08/12/2021.