Where was K-9 (2009–) filmed?
British/Australian comedy/adventure series
K-9 (2009–) was filmed in Brisbane, 1 place named in its Wikipedia article's Production section, in Australia. 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.
Part of the Doctor Who franchise
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
Brisbane
Australia
Capital city of Queensland, Australia
“The series is produced in Brisbane, Australia, shooting on location around the city and on a set built in a South Brisbane warehouse.” Wikipedia