Towns & cities
Nagu
Former municipality in Finland, now part of Pargas
Wikipedia names Nagu as where 1 film or series was filmed; its page links to the sentence that says so. Wikidata records no shoot here yet. Newspapers, film offices and archives name more, listed below.

Filmed here, per Wikipedia
Wikipedia says these were filmed in Nagu. Each title’s page links to the sentence that says so.
From published sources
Newspapers, film offices, archives and city filming permits say these were filmed at Nagu. Each source is linked.
Filming locations nearby
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Landscapes & nature
Turku Archipelago
Finland · 8 km north-east
Archipelago in Southwestern Finland
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Landscapes & nature
Kirjais
Finland · 9 km south
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Landmarks & buildings
Röölä
Finland · 17 km north
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Landscapes & nature
Lenholmen
Finland · 18 km east
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Towns & cities
Pettebyviken
Finland · 20 km north-east
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Landmarks & buildings
Pargas Local History Museum
Finland · 25 km north-east