Landscapes & nature
Saimaa
The largest lake in Finland and the fourth largest lake in Europe
Wikipedia names Saimaa as where 1 film or series was filmed; its page links to the sentence that says so. Wikidata records no shoot here yet.

Filmed here, per Wikipedia
Wikipedia says these were filmed in Saimaa. Each title’s page links to the sentence that says so.
Filming locations nearby
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Towns & cities
Taipalsaari
Finland · 14 km south-west
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Landmarks & buildings
Lappeenranta Summer Theatre
Finland · 21 km south
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Towns & cities
Lappeenranta
Finland · 22 km south
City in the region of South Karelia in Finland
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Towns & cities
Imatra
Finland · 29 km east
Town in the region of South Karelia in Finland
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Landmarks & buildings
Virmutjoki
Finland · 30 km east
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Towns & cities
Ruokolahti
Finland · 31 km east
Municipality in the region of South Karelia in Finland