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Location Poland, mazowieckie
Central coordinates 21o 45.00' East  52o 40.00' North
IBA criteria C6
Area 85,060 ha
Altitude 100 - 150m
Year of IBA assessment 2010

Ogólnopolskie Towarzystwo Ochrony Ptaków

Site description One of the largest remaining complexes of natural forest in the Mazowsze region, situated between the Bug and the Narew rivers, and drained by the Brok, Struga, Truche³ka, Turka and Wymakacz rivers. Stands are 40-80 years old, in more or less dense tracts, interspersed with meadows, ponds and willow Salix scrub. Seventy percent of the forest is a monoculture of pine Pinus or is mixed forest of oak Quercus and Pinus, 10% is broadleaved dominated by hornbeam Carpinus, and the rest is broadleaved riverine forest. Two fish-pond complexes and a dozen or so villages are located in the middle of the site.

Key Biodiversity A total of 193 species have been recorded. Breeding species of global conservation concern that do not meet IBA criteria: Gallinago media.

Populations of IBA trigger species

Species Season Period Population estimate Quality of estimate IBA Criteria IUCN Category
European Nightjar Caprimulgus europaeus breeding  2009  150 breeding pairs  poor  C6  Least Concern 
Black Woodpecker Dryocopus martius breeding  2009  300-350 breeding pairs  poor  C6  Least Concern 
Wood Lark Lullula arborea breeding  2009  800 breeding pairs  medium  C6  Least Concern 
Barred Warbler Sylvia nisoria breeding  2009  200-250 breeding pairs  medium  C6  Least Concern 
Tawny Pipit Anthus campestris breeding  2009  250-300 breeding pairs  medium  C6  Least Concern 

Protected areas

Protected area Designation Area (ha) Relationship with IBA Overlap with IBA (ha)  
Bartnia Nature Reserve 15 protected area contained by site 15  
Popóawy Nature Reserve 6 protected area contained by site 6  
Wielgolas Nature Reserve 7 protected area contained by site 7  


IUCN habitat Habitat detail Extent (% of site)
Forest Alluvial and very wet forest; Mixed woodland; Native coniferous woodland  71%
Wetlands (inland) Rivers and streams; Standing freshwater; Water fringe vegetation  2%
Artificial - terrestrial Arable land; Ruderal land  21%
Grassland   5%
Other   1%

Land use

Land-use Extent (% of site)
agriculture 25%
fisheries/aquaculture 5%
forestry 70%
hunting -

Protection status National Low International None15 ha of IBA covered by Nature Reserve (Bartnia [Bird Reserve], 15 ha). 6 ha of IBA covered by Nature Reserve (Pop³awy, 6 ha). 7 ha of IBA covered by Nature Reserve (Wielgolas, 7 ha).

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

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