Where was Road to Salina filmed?
1970 film by Georges Lautner
Road to Salina (1970) was filmed in Billancourt Studios, 1 place named in its Wikipedia article, in France. 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 1 place. Each links to the sentence that says so.
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Studios & sets
Billancourt Studios
France
Film studios located in Paris
“Interiors were shot at the Billancourt Studios in Paris with sets designed by the art director Jean d'Eaubonne.” Wikipedia