Landscapes & nature
Tangeum Lake
Lake in South Korea
Wikipedia names Tangeum Lake 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 Tangeum Lake. Each title’s page links to the sentence that says so.
Filming locations nearby
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Towns & cities
Chungju
South Korea · 8 km south-east
City in North Chungcheong Province, South Korea
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Towns & cities
Dongnyang-myeon
South Korea · 14 km east
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Landmarks & buildings
Jungwon University
South Korea · 23 km south
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Towns & cities
Hansu-myeon
South Korea · 24 km south-east
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Towns & cities
Goesan County
South Korea · 24 km south
Administrative division of South Korea
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Towns & cities
Suanbo-myeon
South Korea · 25 km south-east