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Location Denmark, Sønderjyllands Amtskommune
Central coordinates 8o 43.00' East  54o 54.00' North
IBA criteria A4i, A4iii, B1i, B2, B3, C2, C3, C4, C6
Area 6,520 ha
Altitude 0 - 10m
Year of IBA assessment 2000

Dansk Ornitologisk Forening



Site description A large area of reclaimed land with meadows along the Vidåen river. In the western part a saltwater lagoon is maintained by pumping in seawater. The inner (eastern) parts are mainly agricultural and the outer (western) parts predominantly pasture. There is also some standing freshwater, notably Rudbøl Sø, and reedbeds.

Populations of IBA trigger species

Species Season Period Population estimate Quality of estimate IBA Criteria IUCN Category
Northern Pintail Anas acuta non-breeding  1994  900 individuals  good  B1i, C3  Least Concern 
Barnacle Goose Branta leucopsis non-breeding  1997  30,000 individuals  good  A4i, B1i, C2, C6  Least Concern 
Brent Goose Branta bernicla non-breeding  1994  6,800 individuals  good  A4i, B1i, C3  Least Concern 
Whooper Swan Cygnus cygnus non-breeding  1994  941 individuals  good  A4i, B1i, C2  Least Concern 
Tundra Swan Cygnus columbianus non-breeding  1993  332 individuals  good  A4i, B1i, B2, C2  Least Concern 
Common Shelduck Tadorna tadorna non-breeding  1994  6,500 individuals  good  A4i, B1i, C3  Least Concern 
Pied Avocet Recurvirostra avosetta breeding  1994  248-482 breeding pairs  good  B1i, B3, C2  Least Concern 
Pied Avocet Recurvirostra avosetta passage  1994  1,300 individuals  good  A4i, B1i, C2  Least Concern 
Eurasian Golden Plover Pluvialis apricaria passage  1994  25,000 individuals  A4i, B1i, C2  Least Concern 
Black-tailed Godwit Limosa limosa breeding  1994  110-125 breeding pairs  good  B2  Near Threatened 
Bar-tailed Godwit Limosa lapponica passage  1994  4,600 individuals  good  A4i, B1i, C2  Least Concern 
Spotted Redshank Tringa erythropus passage  1994  1,270 individuals  good  A4i, B1i, C3  Least Concern 
Red Knot Calidris canutus passage  1994  21,300 individuals  good  A4i, B1i, C3  Least Concern 
Dunlin Calidris alpina passage  1994  62,000 individuals  good  A4i, B1i, C3  Least Concern 
Black Tern Chlidonias niger breeding  1994  36-41 breeding pairs  good  C2, C6  Least Concern 
A4iii Species group - waterbirds non-breeding  20,000-49,999 individuals  unknown  A4iii, C4   
A4iii Species group - waterbirds passage  1994  100,000-499,999 individuals  unknown  A4iii, C4   

Protected areas

Protected area Designation Area (ha) Relationship with IBA Overlap with IBA (ha)  
Kiers Gård Margrethe Kog Protected by Conservation Order 2 protected area contained by site 2  
Margrethe Kog Protected by Conservation Order 1,320 protected area contained by site 1,245  
Tondermarsken Statsfredning Protected by Conservation Order 2,490 protected area contained by site 2,490  
Vadehavet National Park 164,400 protected area overlaps with site 0  
Vadehavet (Wadden Sea) Wetlands of International Importance (Ramsar) 150,482 protected area contains site 6,520  
Vadehavet med Ribe Å, Tved Å og Varde Å vest for Varde - DK00AY176 Habitats Directive 134,732 protected area overlaps with site 814  
Vidå med tilløb, Rudbøl Sø og Magisterkogen - DK009X182 Habitats Directive 494 protected area overlaps with site 351  
Vidåen, Tøndermarsken og Saltvandssøen - DK009X060 Birds Directive 6,498 protected area contained by site 6,498  

Habitats

IUCN habitat Habitat detail Extent (% of site)
Coastline Lagoons; Salt marshes  30%
Artificial - terrestrial   70%

Land use

Land-use Extent (% of site)
nature conservation and research 15%
agriculture 85%

Protection status National Partial International High6,520 ha of IBA covered by Special Protection Area (Vidåen, Tøndermarsken and Saltvandsøen, 6,520 ha).

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Recommended citation  BirdLife International (2014) Important Bird Areas factsheet: Tøndermarsken, Magisterkog and Rudbøl Sø. Downloaded from http://www.birdlife.org on 22/08/2014

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