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Location Finland, Etelä-Suomen lääni
Central coordinates 25o 40.00' East  60o 21.00' North
IBA criteria A4i, B1i, B3, C2, C3
Area 899 ha
Year of IBA assessment 2000


Site description A large, richly vegetated delta of the Porvoo river, with few small meadows along the shores. At the heart of the site is a largish, shallow area of open water (Stenbölefjärden) bordered by belts of Phragmites.

Populations of IBA trigger species

Species Season Period Population estimate Quality of estimate IBA Criteria IUCN Category
Whooper Swan Cygnus cygnus passage  1996  400-500 individuals  good  B1i, C2  Least Concern 
Smew Mergellus albellus passage  1996  200-250 individuals  good  A4i, B1i, C2  Least Concern 
Goosander Mergus merganser passage  1996  3,000-3,500 individuals  good  A4i, B1i, C3  Least Concern 
Eurasian Reed-warbler Acrocephalus scirpaceus breeding  1996  90-130 breeding pairs  poor  B3  Least Concern 

Protected areas

Protected area Designation Area (ha) Relationship with IBA Overlap with IBA (ha)  
Porvoonjoen suisto-Stensböle - FI0100074 Birds Directive 1,331 protected area overlaps with site 706  
Porvoonjoki Delta Baltic Sea Protected Area (Helcom) 1,326 protected area overlaps with site 764  
Porvoonjoki Estuary - Stensböle Wetlands of International Importance (Ramsar) 1,330 protected area contains site 899  
Ruskiksen luonnonsuojelualue Private Nature Reserve 196 protected area contained by site 226  
Stensbölefjärdenin luonnonsuojelualue Private Nature Reserve 277 unknown 0  
Stensbölen luonnonsuojelualue 1 Private Nature Reserve 60 unknown 0  


IUCN habitat Habitat detail Extent (% of site)
Grassland Alpine, subalpine and boreal grassland  5%
Coastline Lagoons  95%

Land use

Land-use Extent (% of site)
urban/industrial/transport 20%
not utilised 10%
tourism/recreation 70%

Protection status National Partial International Partial446 ha of IBA covered by Protected Area on Private Lands (Ruskis, 226 ha, Stensböle, 85 ha, Stenbölefjärden, 273 ha). 235 ha of IBA covered by Ramsar Site (Ruskis, 235 ha). 764 ha of IBA covered by Special Protection Area (Porvoonjoen suisto-Stensböle).

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Recommended citation  BirdLife International (2014) Important Bird Areas factsheet: Porvoonjoki Delta. Downloaded from on 20/10/2014

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