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Lapinjärvi (Lappträsk in Swedish) is a municipality of Finland.
It is located in the province of Southern Finland and is part of the Eastern Uusimaa region. The municipality has a population of 2,977 (2003) and covers an area of 339.31 km² of which 8.38 km² is water. The population density is 8.8 inhabitants per km².
The municipality is bilingual, with majority being Finnish and minority Swedish speakers.