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Location Denmark, Vestsjællands Amtskommune
Central coordinates 11o 20.00' East  55o 35.00' North
IBA criteria A4i, B1i, B2, C2, C3, C6
Area 2,890 ha
Altitude 2 - 10m
Year of IBA assessment 2000

Dansk Ornitologisk Forening

Site description A large, shallow freshwater lake with associated grazed meadows and reedbeds and a small river valley.

Key Biodiversity An important staging area for Cygnus columbianus. Lower numbers of swans Cygnus recorded in recent years may be due to changes in census timings. Botaurus stellaris, Circus aeruginosus, Recurvirostra avosetta and Sterna albifrons, listed on Annex I of the EC Birds Directive, breed at the site. Species of global conservation concern that do not meet IBA criteria: Haliaeetus albicilla (non-breeding).

Populations of IBA trigger species

Species Season Period Population estimate Quality of estimate IBA Criteria IUCN Category
Greylag Goose Anser anser passage  1994  2,024 individuals  good  B1i, C3  Least Concern 
Whooper Swan Cygnus cygnus passage  1994  1,993 individuals  good  A4i, B1i, C2  Least Concern 
Tundra Swan Cygnus columbianus non-breeding  1996  475 individuals  good  A4i, B1i, B2, C2, C6  Least Concern 

IBA Monitoring

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

Anser fabalis Bean Goose 2000 1400 individuals 70 near favourable
Anser anser Greylag Goose 7215 6500 individuals 91 favourable
Milvus milvus Red Kite 1 1 breeding pairs 100 favourable
Circus cyaneus 5 5 individuals 100 favourable
Hydroprogne caspia Caspian Tern 1 1 individuals 100 favourable
Sternula albifrons Little Tern 12 2 breeding pairs 17 very unfavourable


IUCN habitat Habitat detail Extent (% of site)
Wetlands (inland) Standing freshwater  95%
Artificial - terrestrial Arable land  5%

Land use

Land-use Extent (% of site)
forestry -
hunting -
tourism/recreation -

Protection status National Low International High2,890 ha of IBA covered by Special Protection Area (Tissø, Lille åmose and Hallenslev Mose, 2,890 ha).

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Recommended citation  BirdLife International (2016) Important Bird and Biodiversity Area factsheet: Tissø, Lille Åmose and Hallenslev Mose. Downloaded from on 28/10/2016

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