Piedras Negras is a city in the
Coahuila state of
Mexico, located at 28.71°N,100.53°W. It borders on the town of
Eagle Pass, Texas across the
Rio Grande or Rio Bravo. Before the Mexican Revolution, Piedras Negras was known as Ciudad Porfirio Diaz. In
2003 Piedras Negras had an estimated population of 132,900 people.
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