Where was Samrajyam filmed?
1990 film directed by Jomon
Samrajyam (1990) was filmed in Chennai and Thiruvananthapuram, 2 places named in its Wikipedia article's Post-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 Post-production section
Wikipedia’s Post-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
“Jayabharathi's house in Chennai and the Thiruvananthapuram airport served as the film's primary shooting locations.” Wikipedia
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Towns & cities
Thiruvananthapuram
India
City in southern India; the capital of Kerala