Where was Sor Citroën filmed?
1967 film by Pedro Lazaga
Sor Citroën (1967) was filmed in Alcalá de Henares, 1 place named in its Wikipedia article's Filming section, in Spain. 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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Towns & cities
Alcalá de Henares
Spain
City of Spain in the Community of Madrid
“Shooting locations included Madrid, Alcalá de Henares and La Robla (León).” Wikipedia