Where was El Mariachi filmed?
1992 film directed by Robert Rodriguez
El Mariachi (1992) was filmed in Ciudad Acuña, 1 place named in its Wikipedia article, in Mexico. Wikidata itself records the shoot only as Mexico. Each place says where its claim comes from.
Part of the Mexico Trilogy
Places per Wikipedia's article
The Wikipedia article names 1 place. Each links to the sentence that says so.
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Towns & cities
Ciudad Acuña
Mexico
Municipal seat of Acuña, State of Coahuila, Mexico
“The film was shot in numerous locations in Ciudad Acuña, Coahuila, located in Northeastern Mexico adjacent to Del Rio, Texas.” Wikipedia
Recorded only at country level
Also filmed in Mexico, but the exact places are not known, so they are not on the map.
Filming locations that are mapped there: Mexico