Where was Southbound filmed?
2015 film
Southbound (2015) was filmed in U.S. Route 66, Twentynine Palms, Amboy and Roy's Motel and Cafe, 4 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 4 places. Each links to the sentence that says so.
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Streets & squares
U.S. Route 66
United States
Former U.S. Numbered Highway in the United States
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Towns & cities
Amboy
United States
Ghost town in San Bernardino County, California, United States
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Towns & cities
Twentynine Palms
United States
City in San Bernardino County, California, United States
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Landmarks & buildings Roy's Motel and Cafe
United States
Building in California, United States