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Östersundom (previously known in Finnish as Itäsalmi) is a subdistrict of Helsinki, Finland, near to the border of Sipoo. The area previously belonged to the municipality of Sipoo, but it was annexed to Helsinki on January 1, 2009 as part of the Southwest Sipoo Association (Finnish: Lounais-Sipoon osakuntaliitos),[1] although the municipality of Sipoo opposed the idea.[2]
