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Location Poland, podlaskie
Central coordinates 22o 52.00' East  53o 5.00' North
IBA criteria C1, C4, C6
Area 24,730 ha
Altitude 107 - 122m
Year of IBA assessment 2010

Ogólnopolskie Towarzystwo Ochrony Ptaków

Site description A marshy stretch of the Narew valley, spanning 58 km between Sura¿ town and ¯ó³tki village, and from 300 m to 4 km wide. The valley has a natural character between Sura¿ and Rzêdziny towns and is periodically flooded. The Narew is a braided, meandering river, and creates a system which occupies the whole width of the valley floor in some places. There is a very rich mosaic of plant communities˜mainly beds of reed Phragmites and sedge Carex, alder Alnus forest and riverside scrub of willow Salix.

Key Biodiversity Breeding species of global conservation concern that do not meet IBA criteria: Aythya nyroca (formerly one pair, now extinct here), Gallinago media (6-8 pairs).

Populations of IBA trigger species

Species Season Period Population estimate Quality of estimate IBA Criteria IUCN Category
Aquatic Warbler Acrocephalus paludicola breeding  2009  38-40 males only  good  C1, C6  Vulnerable 
A4iii Species group - waterbirds passage  2009  16,000-25,000 individuals  good  C4   

Protected areas

Protected area Designation Area (ha) Relationship with IBA Overlap with IBA (ha)  
Narew River National Park Wetlands of International Importance (Ramsar) 7,350 protected area contained by site 7,350  
Narwianski PN National Park 7,350 protected area contained by site 7,350  


IUCN habitat Habitat detail Extent (% of site)
Forest Alluvial and very wet forest; Broadleaved deciduous woodland; Mixed woodland; Native coniferous woodland  17%
Other   1%
Grassland Humid grasslands; Mesophile grasslands; Steppes and dry calcareous grassland  23%
Wetlands (inland) Fens, transition mires and springs; Raised bogs; Rivers and streams; Standing freshwater; Water fringe vegetation  22%
Artificial - terrestrial Arable land; Highly improved re-seeded landscapes; Ruderal land  37%

Land use

Land-use Extent (% of site)
agriculture 10%
nature conservation and research 78%
tourism/recreation 5%
water management 7%
hunting -

Protection status National Partial International None7,350 ha of IBA covered by National Park (Narwiañski, 7,350 ha).

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Recommended citation  BirdLife International (2016) Important Bird and Biodiversity Area factsheet: Marshy Valley of the Narew River. Downloaded from on 27/10/2016

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