Where was Mr. Plankton filmed?
2024 South Korea web series
Mr. Plankton (2024–) was filmed in Jeju Island, 1 place named in its Wikipedia article's Controversy section, in South Korea. Wikidata records no filming location for it at all, so the article is the only recorded source. Each place says where its claim comes from.
Places per Wikipedia's Controversy section
Wikipedia’s Controversy section names 1 place. Each links to the sentence that says so.
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Landscapes & nature
Jeju Island
South Korea
Island south of the Korean peninsula, part of the Jeju Special Autonomous Province of South Korea
“On October 16, 2023, the production company of the series told Newsen about a netizen's claim that the filming crew illegally dumped trash after filming on Jeju Island.” Wikipedia