Mäntyharju

Mäntyharju
Municipality
Mäntyharjun kunta
Mäntyharju kommun
Mäntyharju is located in the Finnish lake region
Location of Mäntyharju in Finland
Coordinates: 61°25′N 026°53′E / 61.417°N 26.883°E / 61.417; 26.883
Country Finland
RegionSouthern Savonia
Sub-regionMikkeli
Charter1595
SeatMäntyharjun asemanseutu
Government
  Municipal managerJuho Järvenpää
Area
 (2018-01-01)
  Total
1,210.98 km2 (467.56 sq mi)
  Land981.26 km2 (378.87 sq mi)
  Water229.23 km2 (88.51 sq mi)
  Rank79th largest in Finland
Population
 (2025-03-31)
  Total
7,056
  Rank131st largest in Finland
  Density7.19/km2 (18.6/sq mi)
Population by native language
  Finnish94.7% (official)
  Swedish0.3%
  Others5%
Population by age
  0 to 1411.2%
  15 to 6451.3%
  65 or older37.5%
Time zoneUTC+02:00 (EET)
  Summer (DST)UTC+03:00 (EEST)
Websitewww.mantyharju.fi

Mäntyharju (Finnish: [ˈmæntyˌhɑrju], lit.'Pine Ridge') is a municipality of Finland. It is located in the Southern Savonia region, about 40 kilometres (25 mi) southwest of Mikkeli. The municipality has a population of 7,056 (31 March 2025) and covers an area of 1,210.98 square kilometres (467.56 sq mi) of which 229.23 km2 (88.51 sq mi) is water. The coastline is almost 1,520 kilometers (940 mi). The population density is 6.2 inhabitants per km².

Neighbouring municipalities: Heinola, Hirvensalmi, Kouvola, Mikkeli, Pertunmaa and Savitaipale. The municipality is unilingually Finnish.

The summer houses or cottages located in the countryside are part of the culture of Finland where most Finnish families spend their summer holidays. Mäntyharju is the municipality which has the fifth most summer houses in Finland. Some of the reasons for Mäntyharju's popularity involve its many pure lakes and a relatively short distance to the Finnish capital Helsinki of approximately 200 kilometres by car. The municipality also has a direct, high-speed train connection to the capital area. Because of the many summer houses, the population of Mäntyharju more than triples during the most popular summer holiday times. Art Centre Salmela in Mäntyharju hosts one of Finland's largest cultural events in July–August.