Landscapes & nature
Hallasan National Park
National park in Jeju-do, South Korea
Wikipedia names Hallasan National Park 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 Hallasan National Park. Each title’s page links to the sentence that says so.
Filming locations nearby
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Landscapes & nature
Jeju Island
South Korea · 2 km north-east
Island south of the Korean peninsula, part of the Jeju Special Autonomous Province of South Korea
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Landscapes & nature Hallasan
South Korea · 2 km south-west
Mountain in Jeju, South Korea
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Towns & cities
Ara-dong
South Korea · 7 km north
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Towns & cities
Donghong-dong
South Korea · 9 km south
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Towns & cities
Nohyeong-dong
South Korea · 9 km north-west
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Towns & cities
Namwon
South Korea · 13 km east