Landscapes & nature
Seongmodo
Island in South Korea
Wikipedia names Seongmodo 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 Seongmodo. Each title’s page links to the sentence that says so.
Filming locations nearby
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Towns & cities
Ganghwa Island
South Korea · 10 km east
Island of Republic of Korea
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Towns & cities Ganghwa County
South Korea · 15 km east
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Towns & cities
Ganghwa-eup
South Korea · 16 km north-east
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Landscapes & nature
Baemikkumi Sculpture Park
South Korea · 20 km south
Sculpture park in Incheon, South Korea
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Towns & cities
Daegot-myeon
South Korea · 22 km east
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Towns & cities
Tongjin-eup
South Korea · 24 km east