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Location Finland, Uudenmaan lääni
Central coordinates 24o 43.30' East  60o 9.14' North
IBA criteria B2, C6
Area 55 ha
Altitude 1 - 3m
Year of IBA assessment 2009


Summary Core area of the site is pool with standing freshwater, which acts as reservoir of sewage plant. Site is nationally best breeding area for two species: Gallinula chloropus and Anas strepera, and one of the best for Podiceps auritus and Larus ridibundus.

Site description Suomenoja has been earlier a bay of sea with river estuary. The bay was separated from the sea and river by dams in 1960’es. Core area of the site is now pool with standing freshwater, which acts as reservoir of sewage plant. The pool gets temporarily water influxes from communal sewage and very rarely from the sea (when water level of the sea rises very high). Next to the pool are pasture and reedbed flooded regularly by sea. SIte includes also few hectares of ruderal land and alluvial forests.

Populations of IBA trigger species

Species Season Period Population estimate Quality of estimate IBA Criteria IUCN Category
Gadwall Mareca strepera breeding  2004-2007  14-25 breeding pairs  good  B2  Least Concern 
Horned Grebe Podiceps auritus breeding  2005-2007  16-18 breeding pairs  good  B2, C6  Least Concern 


IUCN habitat Habitat detail Extent (% of site)
Wetlands (inland) Rivers and streams; Standing freshwater; Water fringe vegetation  70%
Artificial - terrestrial Ruderal land  10%
Forest Alluvial and very wet forest; Mixed woodland  20%

Land ownership Municipality of Espoo and Fortum (powerplant owner next to the site).

Land use

Land-use Extent (% of site)
agriculture minor
tourism/recreation major
urban/industrial/transport minor

References Lammi, E. & Routasuo, P. 2001: Monitoring the bird wetlands of Espoo municipality in 2000. – Environment Council of Espoo municipality, publication 1/2001 (in Finnish, 65 pages) Leivo, M., Asanti, T., Koskimies, P., Lammi, E., Lampolahti, J., Mikkola-Roos, M. & Virolainen, E. 2002: Finnish important bird areas – FINIBA. – BirdLife Finland’s conservation publication nr 4 (in Finnish, 142 pages). Rassi, P., Alanen, A., Kanerva, T. & Mannerkoksi, I. (editors) 2001: The 2000 Red List of Finnish Species. – Ministry of Environment and Finnish Environment Research Center. (in Finnish, 432 pages). Rusanen, Pekka 2005: Statement of values of the Suomenoja. – Annex in the complaint made on the plan of harbour, next to the FINIBA-site Suomenoja.

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Recommended citation  BirdLife International (2014) Important Bird Areas factsheet: Suomenoja. Downloaded from on 24/09/2014

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