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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
Lesser Spotted Eagle Clanga pomarina breeding  40 breeding pairs  B2, C6  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  
Prasnik Special Reserve 52 protected area contained by site 60  
Rakita Na Lonjskom Polju Special Reserve 430 protected area contained by site 143  
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 (2016) Important Bird and Biodiversity Area factsheet: Lower Sava river. Downloaded from on 22/10/2016

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