Towns & cities
Ganghwa Island
Island of Republic of Korea
Wikipedia names Ganghwa Island as where 2 films and series were filmed; each title’s page links to the sentence that says so. Wikidata records no shoot here yet.

Filmed here, per Wikipedia
Wikipedia says these were filmed in Ganghwa Island. Each title’s page links to the sentence that says so.
Filming locations nearby
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Towns & cities Ganghwa County
South Korea · 5 km north-east
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Towns & cities
Ganghwa-eup
South Korea · 6 km north-east
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Landscapes & nature
Seongmodo
South Korea · 10 km west
Island in South Korea
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Towns & cities
Daegot-myeon
South Korea · 13 km south-east
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Towns & cities
Tongjin-eup
South Korea · 14 km east
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Landscapes & nature
Baemikkumi Sculpture Park
South Korea · 20 km south
Sculpture park in Incheon, South Korea