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Location Poland, mazowieckie
Central coordinates 21o 59.00' East  52o 10.00' North
IBA criteria C1, C6
Area 14,160 ha
Year of IBA assessment 2010

Ogólnopolskie Towarzystwo Ochrony Ptaków

Populations of IBA trigger species

Species Season Period Population estimate Quality of estimate IBA Criteria IUCN Category
Corncrake Crex crex breeding  1999  50-80 males only  C1  Least Concern 
Black Tern Chlidonias niger breeding  2002  40-50 breeding pairs  C6  Least Concern 


IUCN habitat Habitat detail Extent (% of site)
Forest   13%
Grassland   76%
Artificial - terrestrial   5%
Wetlands (inland)   5%
Other   1%

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Recommended citation  BirdLife International (2016) Important Bird and Biodiversity Area factsheet: Kostrzyn River Valley. Downloaded from on 26/10/2016

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