Where was Yellow Sky filmed?
1948 film by William A. Wellman
Yellow Sky (1948) was filmed in Death Valley National Park, 1 place 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 1 place. Each links to the sentence that says so.
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Landscapes & nature
Death Valley National Park
United States
National park in California and Nevada in the United States
“Exteriors were also filmed at Death Valley National Monument, with the cast and crew living at Furnace Creek Inn and Camp, which was leased from the Pacific Coast Borax Company.” Wikipedia