Tøndermarsken, Magisterkog and Rudbøl Sø

Country/territory: Denmark

IBA Criteria met: A4i, A4iii, B1i, B2, B3, C2, C3, C4, C6 (2000)
For more information about IBA criteria please click here

Area: 6,520 ha

Protection status:

Dansk Ornitologisk Forening
Most recent IBA monitoring assessment
Year of assessment Threat score (pressure) Condition score (state) Action score (response)
2010 high very unfavourable low
For more information about IBA monitoring please click here

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.

Key biodiversity
This is a very important staging area for several waterbirds, with total numbers exceeding 20,000 individuals. Several species listed on Annex I of the EC Birds Directive breed at the site, including Botaurus stellaris, Ciconia ciconia, Circus aeruginosus, Circus pygargus, Porzana porzana, Recurvirostra avosetta, Sterna hirundo, S. paradisaea, S. albifrons, Chlidonias niger (the most important site in Denmark for this species) and Luscinia svevica.

Recommended citation
BirdLife International (2021) Important Bird Areas factsheet: Tøndermarsken, Magisterkog and Rudbøl Sø. Downloaded from on 08/03/2021.