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Location Sweden, Stockholm
Central coordinates 18o 24.10' East  59o 3.93' North
IBA criteria B2, C6
Area 13,600 ha
Altitude 20 - 70m
Year of IBA assessment 2000

Sveriges Ornitologiska Förening

Key Biodiversity This site is important for forest species, including raptors and owls, and some waterbirds. Species of global conservation concern that do not meet IBA criteria: Haliaeetus albicilla (breeding and wintering).

Populations of IBA trigger species

Species Season Period Population estimate Quality of estimate IBA Criteria IUCN Category
Arctic Loon Gavia arctica breeding  44-52 breeding pairs  B2, C6  Least Concern 
Eurasian Eagle-owl Bubo bubo breeding  1-3 breeding pairs  B2, C6  Least Concern 
European Nightjar Caprimulgus europaeus breeding  40-70 breeding pairs  B2, C6  Least Concern 

Protected areas

Protected area Designation Area (ha) Relationship with IBA Overlap with IBA (ha)  
Bromseby Nature Reserve 18 protected area contained by site 14  
Domarudden Nature Reserve 23 protected area contained by site 23  
Trehörningsskogen Nature Reserve 179 protected area contained by site 172  


IUCN habitat Habitat detail Extent (% of site)
Forest Mixed woodland; Native coniferous woodland  70%
Wetlands (inland) Raised bogs; Standing freshwater  25%
Artificial - terrestrial Arable land  5%

Land use

Land-use Extent (% of site)
forestry 70%
agriculture 5%
tourism/recreation 15%
not utilised 10%

Protection status National Low International None16 ha of IBA covered by Nature Reserve (Bromseby, 16 ha). 216 ha of IBA covered by Nature Reserve (Trehörningen, 216 ha).

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Recommended citation  BirdLife International (2016) Important Bird and Biodiversity Area factsheet: Tarnan-Riala forest. Downloaded from on 26/10/2016

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