Where was Hospital Ship filmed?
2017 South Korean television series
Hospital Ship (2017–) was filmed in Geoje and Geojedo, 2 places named in its Wikipedia article, 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 article
The Wikipedia article names 2 places. Each links to the sentence that says so.
