Where was Rose Marie filmed?
1936 film by W. S. Van Dyke
Rose Marie (1936) was filmed in Lake Tahoe, 1 place named in its Wikipedia article's Production section, in the United States. 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 Production section
Wikipedia’s Production section names 1 place. Each links to the sentence that says so.
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Landscapes & nature
Lake Tahoe
United States
Lake in California and Nevada, United States
“While footage of the Mounties in boot camp was filmed in Canada, location filming with the lead actors occurred at Lake Tahoe.” Wikipedia