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Location Denmark, Ribe Amtskommune
Central coordinates 8o 15.00' East  55o 42.00' North
IBA criteria A4i, A4iii, B1i, B2, B3, C2, C3, C4, C6
Area 4,270 ha
Altitude 0 - 27m
Year of IBA assessment 2000

Dansk Ornitologisk Forening

Site description Mainly open agricultural land on a drained former lake with some small plantations. The site also includes two shallow lakes surrounded by reedbeds with Alnus forest and some heathland.

Key Biodiversity An exceptionally important staging area, particularly for Anser brachyrhynchus and A. anser. Botaurus stellaris, Branta leucopsis, Circus aeruginosus and Lanius collurio, listed on Annex I of the EC Birds Directive, breed at the site.

Populations of IBA trigger species

Species Season Period Population estimate Quality of estimate IBA Criteria IUCN Category
Northern Pintail Anas acuta non-breeding  1994  3,000 individuals  medium  B1i, C3  Least Concern 
Pink-footed Goose Anser brachyrhynchus passage  1994  30,000 individuals  good  A4i, B1i, C3  Least Concern 
Greylag Goose Anser anser passage  1994  22,000 individuals  medium  A4i, B1i, C3  Least Concern 
Whooper Swan Cygnus cygnus winter  1994  471 individuals  good  B1i, B3, C2  Least Concern 
Tundra Swan Cygnus columbianus winter  1995  479 individuals  good  A4i, B1i, B2, C2, C6  Least Concern 
A4iii Species group - waterbirds passage  1994  50,000-99,999 individuals  unknown  A4iii, C4   

IBA Monitoring

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

Pluvialis apricaria Eurasian Golden Plover 20000 20000 individuals 100 favourable
Eudromias morinellus Eurasian Dotterel 74 69 individuals 94 favourable

Protected areas

Protected area Designation Area (ha) Relationship with IBA Overlap with IBA (ha)  
Filso Wetlands of International Importance (Ramsar) 4,270 protected area contains site 4,270  


IUCN habitat Habitat detail Extent (% of site)
Shrubland Heathland  20%
Wetlands (inland) Standing freshwater  80%

Land use

Land-use Extent (% of site)
agriculture 40%
forestry 5%
unknown 55%

Protection status National Partial International High4,270 ha of IBA covered by Ramsar Site (Fiilsø, 4,320 ha). 1,994 ha of IBA covered by Special Protection Area (Fiilsø, 1,994 ha).

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

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