Where was Flying Elephants filmed?
1928 film by Frank Butler
Flying Elephants (1928) was filmed in Moapa Valley and Moapa, 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.

