Where was Undine (1916) filmed?
1916 film by Henry Otto
Undine (1916) was filmed in Channel Islands of California and Santa Cruz Island, 2 places named in its Wikipedia article's Production section, 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 Production section
Wikipedia’s Production section names 2 places. Each links to the sentence that says so.
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Landscapes & nature
Channel Islands of California
United States
Island chain in the Pacific Ocean off the coast of southern California along the Santa Barbara Channel
“Location scenes of Undine were filmed at Santa Cruz Island, one of the Channel Islands of California.” Wikipedia
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Towns & cities Santa Cruz Island
United States
Island in Santa Barbara County, California, United States