Where was La Métamorphose des cloportes filmed?
1965 film by Pierre Granier-Deferre
La Métamorphose des cloportes (1965) was filmed in hippodrome de Vincennes, 1 place named in its French Wikipedia’s Production section, 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 French Wikipedia's Production section
French Wikipedia’s Production section names 1 place. Each links to the sentence that says so.