Where was Nightmare at Noon filmed?
1988 film directed by Nico Mastorakis
Nightmare at Noon (1988) was filmed in Moab and Arches National Park, 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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Landscapes & nature
Arches National Park
United States
National park in Grand County, Utah, United States
“The film was shot on-location in Moab and Arches National Park, Utah.” Wikipedia
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Towns & cities
Moab
United States
City in and county seat of Grand County, Utah, United States