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Location Poland, podlaskie
Central coordinates 22o 11.00' East  53o 7.00' North
IBA criteria C1, C6
Area 7,273 ha
Altitude 100 - 120m
Year of IBA assessment 2010

Ogólnopolskie Towarzystwo Ochrony Ptaków

Site description The site comprises the Narew river valley between the drained Wizna marshes and the town of £om¿a. The valley is narrow (up to 1.2 km wide) and deeply cut into the plain, with a close to natural character. The valley bottom is covered mainly by peat, to varying depths. There are yearly floods, especially in spring. Flood-plain vegetation includes submerged waterweed (e.g. Potamogeton), reedbeds Phragmites, meadows, sedge-beds, dry sandy grassland, and fragmented forest of alder Alnus. Valley slopes are covered with oak Quercus forest, above which is patchy dry-ground forest of lime Tilia and hornbeam Carpinus.

Populations of IBA trigger species

Species Season Period Population estimate Quality of estimate IBA Criteria IUCN Category
Corncrake Crex crex breeding  2006  110-115 males only  good  C1  Least Concern 
Great Snipe Gallinago media breeding  1994  15 males only  C6  Near Threatened 
Aquatic Warbler Acrocephalus paludicola breeding  2006  9 males only  good  C1  Vulnerable 

Protected areas

Protected area Designation Area (ha) Relationship with IBA Overlap with IBA (ha)  
Bagno Wizna - PLB200005 Birds Directive 14,471 protected area is adjacent to site 0  
Dolina Dolnej Narwi - PLB140014 Birds Directive 26,528 protected area is adjacent to site 0  
Przelomowa Dolina Narwi - PLC200003 Birds Directive 0 protected area overlaps with site 4,317  


IUCN habitat Habitat detail Extent (% of site)
Forest Alluvial and very wet forest; Broadleaved deciduous woodland  10%
Grassland Humid grasslands; Steppes and dry calcareous grassland  15%
Wetlands (inland) Fens, transition mires and springs; Raised bogs; Rivers and streams; Standing freshwater; Water fringe vegetation  75%

Land use

Land-use Extent (% of site)
agriculture 80%
tourism/recreation 10%
forestry 10%
hunting -

Protection status National None International None

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Recommended citation  BirdLife International (2014) Important Bird Areas factsheet: Narew river gaps. Downloaded from on 23/10/2014

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