Where was Nishabd filmed?
2007 film by Ram Gopal Varma
Nishabd (2007) was filmed in Munnar, 1 place 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 1 place. Each links to the sentence that says so.
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Towns & cities
Munnar
India
Town in Idukki district, Kerala, India
“The film was shot in 20 days in Munnar, Kerala.” Wikipedia