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Location Croatia, Brodsko-posavska zupanija,Sisacko-moslavacka zupanija,Vukovarsko-srijemska zupanija
Central coordinates 16o 52.08' East  45o 20.54' North
IBA criteria B2, C6
Area 129,256 ha
Altitude 90 - 105m
Year of IBA assessment 2005

Association BIOM (Affiliate)

Site description This lowland area (the largest retention in Croatia) comprises extensive wet pastures, alluvial oak forests, riverine forests and scrubs, numerous temporary and permanent water bodies: fishponds, ponds, oxbows, pits, rivers (Sava, Lonja and other smaller rivers), canals (Strug, Trebez), etc. The most important parts of the area are Nature Park Lonjsko polje and fishponds. It is the most important area for breeding of Night Heron, Black and White Stork and Corncrakes in Croatia. Forests in this area are important breeding sites for White-tailed Eagle, Lesser Spotted Eagle, Middle Spotted Woodpecker and Collared Flycatcher in Croatia. The main threats to birds originate from drainage, river canalization, agricultural intensification, changes in traditional farming, changes of water level in wet forests due to drainage, possible loss of carp fishponds due to abandonment of fish production, intensified forest management, excessive or illegal hunting and unregulated recreational activities and tourism.

Populations of IBA trigger species

Species Season Period Population estimate Quality of estimate IBA Criteria IUCN Category
Ferruginous Duck Aythya nyroca breeding  70-80 breeding pairs    Near Threatened 
Black Stork Ciconia nigra breeding  72 breeding pairs    Least Concern 
White Stork Ciconia ciconia breeding  570 breeding pairs    Least Concern 
Eurasian Spoonbill Platalea leucorodia breeding  70 breeding pairs    Least Concern 
Black-crowned Night-heron Nycticorax nycticorax breeding  300 breeding pairs    Least Concern 
Purple Heron Ardea purpurea breeding  23-24 breeding pairs    Least Concern 
Great Egret Casmerodius albus winter  100-200 individuals    Least Concern 
Little Egret Egretta garzetta breeding  200 breeding pairs    Least Concern 
European Honey-buzzard Pernis apivorus breeding  35 breeding pairs    Least Concern 
Black Kite Milvus migrans breeding  35 breeding pairs    Least Concern 
White-tailed Eagle Haliaeetus albicilla breeding  43 breeding pairs    Least Concern 
Western Marsh-harrier Circus aeruginosus breeding  10 breeding pairs    Least Concern 
Montagu's Harrier Circus pygargus breeding  2-3 breeding pairs    Least Concern 
Lesser Spotted Eagle Aquila pomarina breeding  40 breeding pairs  B2, C6  Least Concern 
Greater Spotted Eagle Aquila clanga winter  2-3 individuals    Vulnerable 
Corncrake Crex crex breeding  230-570 males only    Least Concern 
Little Crake Porzana parva breeding  5 breeding pairs    Least Concern 
Spotted Crake Porzana porzana breeding  10 breeding pairs    Least Concern 
Whiskered Tern Chlidonias hybrida breeding  500-900 breeding pairs    Least Concern 
Middle Spotted Woodpecker Dendrocopos medius breeding  2,000-2,100 breeding pairs    Least Concern 
Collared Flycatcher Ficedula albicollis breeding  1,500-1,700 breeding pairs    Least Concern 

Protected areas

Protected area Designation Area (ha) Relationship with IBA Overlap with IBA (ha)  
Donja Posavina Other Area 121,177 is identical to site 121,177  
Krapje dol Special Reserve 25 protected area contained by site 26  
Lonjsko Polje Nature Park 50,650 protected area contained by site 51,151  
Lonjsko Polje and Mokro Polje (incl. Krapje Djol) Wetlands of International Importance (Ramsar) 50,560 protected area contained by site 50,560  
Pasnjak Iva Protected Landscape 268 protected area contained by site 268  
Prasnik Special Reserve 52 protected area contained by site 60  
Rakita Na Lonjskom Polju Special Reserve 430 protected area contained by site 143  
Sunjsko Polje Protected Landscape 20,330 protected area contained by site 20,330  
Vrazje Blato Other 77 protected area contained by site 79  


IUCN habitat Habitat detail Extent (% of site)
Forest Alluvial and very wet forest; Broadleaved deciduous woodland  40%
Grassland Humid grasslands  10%
Wetlands (inland) Rivers and streams; Standing freshwater; Water fringe vegetation  20%
Artificial - terrestrial Arable land; Other urban and industrial areas; Perennial crops, orchards and groves; Ruderal land  40%

Land use

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

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Recommended citation  BirdLife International (2014) Important Bird Areas factsheet: Lower Sava river. Downloaded from on 25/04/2014

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