Where was Beneath the 12-Mile Reef filmed?
1953 film by Robert D. Webb
Beneath the 12-Mile Reef (1953) was filmed in Nassau, Key West and Tarpon Springs, 3 places named in its Wikipedia article, in The Bahamas, the United States. Wikidata itself records the shoot only as Florida. Each place says where its claim comes from.
Places per Wikipedia's article
The Wikipedia article names 3 places. Each links to the sentence that says so.
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Towns & cities
Nassau
The Bahamas
Capital and largest city of the Bahamas
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Towns & cities
Key West
United States
County seat of Monroe County, Florida, United States
“The film was shot on location in Key West and Tarpon Springs, Florida.” Wikipedia
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Towns & cities
Tarpon Springs
United States
City in Pinellas County, Florida, United States
Recorded only at country level
Also filmed in Florida, but the exact places are not known, so they are not on the map.
Filming locations that are mapped there: United States