Piedras Negras (Spanish pronunciation: [ˈpjeðɾas ˈneɣɾas] ⓘ lit. ' Black Rocks ') is a city and seat of the surrounding municipality of the same name in the Mexican state of Coahuila.It stands at the northeastern edge of Coahuila on the Mexico–United States border, across the Rio Grande from Eagle Pass in the U.S. state of Texas.In the 2015 census the city had a population of 163,595 ... More @Wikipedia
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