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Location Poland, lubelskie,mazowieckie,podlaskie
Central coordinates 22o 21.00' East  52o 19.00' North
IBA criteria C1, C2, C6
Area 73,380 ha
Altitude 85 - 116m
Year of IBA assessment 2010

Ogólnopolskie Towarzystwo Ochrony Ptaków

Site description The site contains the channel and valley of the Bug river between the Krzna river tributary and the Zegrzyñski reservoir (260 km), with adjacent extensive dry pastures. The whole area floods in spring. There are some swamps and mires at the mouths of tributaries entering the Bug. The river channel is generally natural, not too modified by man, so there are numerous bare sand islands and others overgrown with ruderal herbs or willow Salix scrub. Elsewhere there are also local remnants of willow or poplar Populus scrub. On the lowest river terrace there are numerous oxbow lakes, differing in size, depth and extent of aquatic vegetation (Potamogeton, Lemna).

Key Biodiversity The site supports more breeding Charadrius hiaticula than any other inland site in Europe.

Populations of IBA trigger species

Species Season Period Population estimate Quality of estimate IBA Criteria IUCN Category
White Stork Ciconia ciconia breeding  1996-1999  240-260 breeding pairs  good  C6  Least Concern 
Western Marsh-harrier Circus aeruginosus breeding  1996-1999  71-85 breeding pairs  C6  Least Concern 
Montagu's Harrier Circus pygargus breeding  1999  23-30 breeding pairs  C6  Least Concern 
Corncrake Crex crex breeding  1999  540-700 males only  C1, C6  Least Concern 
Spotted Crake Porzana porzana breeding  1999  50 males only  unknown  C6  Least Concern 
Little Tern Sternula albifrons breeding  1999  62-70 breeding pairs  C6  Least Concern 
Black Tern Chlidonias niger breeding  1998-1999  360-380 breeding pairs  C2, C6  Least Concern 
Common Kingfisher Alcedo atthis breeding  1999  82 breeding pairs  C6  Least Concern 

Protected areas

Protected area Designation Area (ha) Relationship with IBA Overlap with IBA (ha)  
L/êg Dêbowy Nature Reserve 133 protected area contained by site 133  
Nadbuÿañski Obszar Chronionego Krajobrazu Protected Landscape Area 55,300 protected area overlaps with site 17,500  
Nadbuzanski Park Krajobrazowy Landscape Park 57,768 protected area overlaps with site 33,000  
Podlaski Przóom Bugu Landscape Park 30,904 protected area overlaps with site 15,000  
Skarpa Moóo_ewska Nature Reserve 2 protected area contained by site 2  
Wydma Moóo_ewska Nature Reserve 64 protected area contained by site 64  


IUCN habitat Habitat detail Extent (% of site)
Forest Alluvial and very wet forest  10%
Artificial - terrestrial   20%
Grassland Humid grasslands; Mesophile grasslands  60%
Wetlands (inland) Fens, transition mires and springs; Rivers and streams; Standing freshwater; Water fringe vegetation  7%
Other   3%

Land use

Land-use Extent (% of site)
agriculture -
hunting -

Protection status National Partial International None133 ha of IBA covered by Nature Reserve (£êg Dêbowy, 133 ha). 2 ha of IBA covered by Nature Reserve (Skarpa Mo³o¿ewska, 2 ha). 64 ha of IBA covered by Nature Reserve (Wydma Mo³o¿ewska, 64 ha). 33,000 ha of IBA covered by Landscape Park (Nadbu¿añski, 53,680 ha). 15,000 ha of IBA covered by Landscape Park (Podlaski Prze³om Bugu, 30,904 ha). 17,500 ha of IBA covered by Protected Landscape Area (Nadbu¿añski, 55,300 ha).

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Recommended citation  BirdLife International (2016) Important Bird and Biodiversity Area factsheet: Lower Bug river valley. Downloaded from on 28/10/2016

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