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Location Denmark, Storstrøms Amtskommune
Central coordinates 11o 31.00' East  54o 46.00' North
IBA criteria A4i, A4iii, B1i, B2, C2, C3, C4, C6
Area 3,810 ha
Altitude 10 - 25m
Year of IBA assessment 2000

Dansk Ornitologisk Forening

Site description Freshwater lakes with wooded islands and peninsulas. Lake shores have parkland, reedbeds, deciduous forests, meadows, fields and scattered habitations. Artificial landscapes are mainly arable and improved grazing-meadows, and may include some more natural humid grasslands but the extent is unknown. The deciduous forest includes extensive areas of Alnus carr, areas of mature Fagus and Quercus forest, and some conifer plantations.

Key Biodiversity The most important freshwater area in Denmark for birds and the only Danish freshwater area designated as a Ramsar Site. A very important breeding site for Botaurus stellaris. More than 20,000 waterbirds regularly occur on passage. Species of global conservation concern that do not meet IBA criteria: Haliaeetus albicilla (1 pair breeding). Circus aeruginosus and Sterna hirundo, both listed on Annex I of the EC Birds Directive, also breed at the site.

Populations of IBA trigger species

Species Season Period Population estimate Quality of estimate IBA Criteria IUCN Category
Greylag Goose Anser anser passage  1994  6,700 individuals  good  A4i, B1i, C3  Least Concern 
Gadwall Mareca strepera passage  1996  328 individuals  B1i, C3  Least Concern 
Common Pochard Aythya ferina non-breeding  1994  15,765 individuals  good  A4i, B1i, C3  Vulnerable 
Tufted Duck Aythya fuligula winter  1994  23,045 individuals  good  A4i, B1i, C3  Least Concern 
Eurasian Bittern Botaurus stellaris breeding  1995  35 breeding pairs  good  B2, C2, C6  Least Concern 
Great Cormorant Phalacrocorax carbo breeding  1995  2,250 breeding pairs  good  A4i, B1i, C3  Least Concern 
White-tailed Sea-eagle Haliaeetus albicilla breeding  1997  1 breeding pairs  good  C6  Least Concern 
A4iii Species group - waterbirds winter  1991  20,000-49,999 individuals  unknown  A4iii, C4   

IBA Monitoring

2010 not assessed very unfavourable not assessed
Good - based on reliable and complete / representative data

Anser fabalis Bean Goose 700 700 individuals 100 favourable
Mergus merganser Goosander 2165 260 individuals 13 very unfavourable
Phalacrocorax carbo Great Cormorant 3375 1469 breeding pairs 44 unfavourable
Pernis apivorus European Honey-buzzard 7 3 breeding pairs 43 unfavourable
Alcedo atthis Common Kingfisher 1 1 breeding pairs 100 favourable

Protected areas

Protected area Designation Area (ha) Relationship with IBA Overlap with IBA (ha)  
Maribo Lakes Wetlands of International Importance (Ramsar) 3,810 is identical to site 3,810  
Maribo Soerne Major Conservation Area 1,195 protected area contained by site 1,195  
Maribosøerne Game Reserve 1,264 protected area contained by site 1,264  


IUCN habitat Habitat detail Extent (% of site)
Forest Broadleaved deciduous woodland  25%
Wetlands (inland) Standing freshwater; Water fringe vegetation  45%
Artificial - terrestrial   30%

Land use

Land-use Extent (% of site)
agriculture 30%
forestry 25%
nature conservation and research 100%

Protection status National Partial International High3,810 ha of IBA covered by Ramsar Site (Maribo lakes, 4,400 ha). 3,810 ha of IBA covered by Special Protection Area (Maribosøerne, 3,810 ha).

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Recommended citation  BirdLife International (2016) Important Bird and Biodiversity Area factsheet: Maribo lakes. Downloaded from on 22/10/2016

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