Where was Nalanum Nandhiniyum filmed?
2014 film
Nalanum Nandhiniyum (2014) was filmed in Chennai and Madurai, 2 places named in its Wikipedia article's Production section, in India. 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 Production section
Wikipedia’s Production section names 2 places. Each links to the sentence that says so.
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Towns & cities
Chennai
India
City and state capital of Tamil Nadu, India
“The film was shot prominently in Chennai, Erode and Madurai.” Wikipedia
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Towns & cities
Madurai
India
City of Tamil Nadu in southern India