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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.

Key Biodiversity A total of 178 species have been recorded, including 125 breeders. Breeding species of global conservation concern that do not meet IBA criteria: Haliaeetus albicilla (one pair), Crex crex.

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 


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 (2016) Important Bird and Biodiversity Area factsheet: Narew river gaps. Downloaded from on 23/10/2016

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