Where was PT 109 filmed?
1963 film by Leslie H. Martinson
PT 109 (1963) was filmed in Florida Keys, 1 place named in its Wikipedia article's Filming 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 Filming section
Wikipedia’s Filming section names 1 place. Each links to the sentence that says so.
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Landscapes & nature
Florida Keys
United States
Coral cay archipelago in Florida, United States of America
“The exteriors were filmed at Little Palm Island (formerly Little Munson Island), now a resort in the Florida Keys.” Wikipedia