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Mäntyharju is a municipality of Finland.
It is located in the province of Eastern Finland and is part of the Southern Savonia region. The municipality has a population of 7,013 (2003) and covers an area of 1,210.49 km² of which 228.03 km² is water. The population density is 7.1 inhabitants per km².
Mäntyharju is a popular holidayplace, mostly because of its pure lakes.
The municipality is unilingually Finnish.