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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.

Key Biodiversity One of the most important breeding and staging areas for waterbirds in the country. Probably the best single congregatory area in spring in Finland for Mergus merganser and M. albellus. Species of global conservation concern that do not meet IBA criteria: Haliaeetus albicilla (max. 2 individuals, passage), Crex crex (max. 3 pairs, breeding).

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 

IBA Monitoring

2010 high very unfavourable medium
Medium - based upon reliable but incomplete / partially representative data

Pollution agricultural & forestry effluents - nutrient loads happening now majority/most of area/population (50-90%) moderate to rapid deterioration high

Cygnus cygnus Whooper Swan 200 200 individuals 100 favourable
Mergellus albellus Smew 200 130 individuals 65 unfavourable
Mergus merganser Goosander 3000 400 individuals 14 very unfavourable
Acrocephalus scirpaceus Eurasian Reed-warbler 90 90 breeding pairs 100 favourable

Most of site (50-90%) covered (including the most critical parts for important bird species)  A comprehensive and appropriate management plan exists that aims to maintain or improve the populations of qualifying bird species  Substantive conservation measures are being implemented but these are not comprehensive and are limited by resources and capacity  medium 

Protected areas

Protected area Designation Area (ha) Relationship with IBA Overlap with IBA (ha)  
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 (2016) Important Bird and Biodiversity Area factsheet: Porvoonjoki Delta. Downloaded from on 21/10/2016

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