Where was Duel in the Sun filmed?
1946 film by King Vidor
Duel in the Sun (1946) was filmed in Tucson, Thousand Oaks, Tuolumne County, San Fernando Valley and Wildwood Regional Park, 5 places named in its Wikipedia article, in the United States. Wikidata itself records the shoot only as California. Each place says where its claim comes from.
Places per Wikipedia's article
The Wikipedia article names 5 places. Each links to the sentence that says so.
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Towns & cities
Thousand Oaks
United States
City in Ventura County, California, United States
“The film was largely shot in Wildwood Regional Park in Thousand Oaks, California.” Wikipedia
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Landscapes & nature
San Fernando Valley
United States
Urbanized valley in Los Angeles County, California, United States
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Landscapes & nature
Wildwood Regional Park
United States
Regional park in Ventura County, California, United States
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Towns & cities
Tuolumne County
United States
County in California, United States
“The train derailment scenes were filmed on the Sierra Railroad in Tuolumne County, California, using a combination of a real train and large scale models.” Wikipedia
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Towns & cities
Tucson
United States
City in and county seat of Pima County, Arizona, United States
Recorded only at country level
Also filmed in California, but the exact places are not known, so they are not on the map.
Filming locations that are mapped there: United States
Also shot in these places
Little Big ManWar film1970- Heart and SoulsHorror film1993
InnerspaceScience fiction film1987
Alice Doesn't Live Here AnymoreRomantic comedy film1974
Tin CupComedy film1996