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Jämsä is a town and municipality of Finland.
It is located in the province of Western Finland and is part of the Central Finland region. The municipality has a population of 15,306 (2003) and covers an area of 1,186.23 km² of which 182.25 km² is water. The population density is 12.9 inhabitants per km².
The municipality is unilingually Finnish.Template:Finland-geo-stub