Rantasalmi is a municipality of Finland. It is located in the Southern Savonia region, 43 kilometres (27 mi) northwest of Savonlinna and 92 kilometres (57 mi) northeast of Mikkeli. The municipality has a population of 3,297 (31 December 2023)^[5] and covers an area of 925.20 square kilometres (357.22 sq mi) of which 366.61 km² (141.55 sq mi) is water.^[1] The population density is 5.89 inhabitants per square kilometre (15.3/sq mi).

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Rantasalmi
Municipality
Rantasalmen kunta Rantasalmi kommun
Rantasalmi centre
Coat of arms
Location of Rantasalmi in Finland
Coordinates: 62°04′N 028°18′E
Country	Finland
Region	Southern Savonia
Sub-region	Pieksämäki sub-region
Charter	1578
Government
• Municipal manager	Kristiina Järvenpää
Area  (2018-01-01)[1]
• Total	925.20 km2 (357.22 sq mi)
• Land	559.53 km2 (216.04 sq mi)
• Water	366.61 km2 (141.55 sq mi)
• Rank	153rd largest in Finland
Population  (2023-12-31)[2]
• Total	3,297
• Rank	208th largest in Finland
• Density	5.89/km2 (15.3/sq mi)
Population by native language [3]
• Finnish	94.1% (official)
• Swedish	0.2%
• Others	5.7%
Population by age [4]
• 0 to 14	11.4%
• 15 to 64	53%
• 65 or older	35.6%
Time zone	UTC+02:00 (EET)
• Summer (DST)	UTC+03:00 (EEST)
Website	www.rantasalmi.fi

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Neighbouring municipalities are Joroinen, Juva, Savonlinna, Sulkava and Varkaus.

The municipality is unilingually Finnish.

Asikkala, Osikonmäki, Putkisalo, Rantasalo, Torasalo, Tornioniemi, Tuusmäki and Vaahersalo.

• Eliel Saarinen (1873–1950), a Finnish–American architect was born in Rantasalmi.
• Laura Netzel (1839-1927), pianist, composer and conductor
• Jukka Lehtonen (born 1982), volleyball player
• Jarkko Immonen (born 1982), ice hockey player
• Lauri Kaukonen (1902-1975), Secretariate Counsellor