Where was The Zulu's Heart filmed?
1908 film
The Zulu's Heart (1908) was filmed in Cliffside Park and Cliffside, 2 places named in its Wikipedia article, in the United States. 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 article
The Wikipedia article names 2 places. Each links to the sentence that says so.
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Towns & cities
Cliffside Park
United States
Borough in Bergen County, New Jersey, United States
“Location footage was shot in Cliffside, New Jersey.” Wikipedia
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Towns & cities
Cliffside
United States
Census-designated place in Rutherford County, North Carolina