Where was Grand Canyon: The Hidden Secrets filmed?
1984 film by Kieth Merrill
Grand Canyon: The Hidden Secrets (1984) was filmed in Grand Canyon and Kanab, 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
Grand Canyon
United States
Steep-sided canyon carved by the Colorado River in Arizona, United States
“In addition to the Grand Canyon, parts of the film were shot in Kanab, Utah.” Wikipedia
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Towns & cities
Kanab
United States
City and county seat of Kane County, Utah, United States