Piedras Negras stands at the north-eastern edge of Coahuila on the U.S.-Mexican border. The Spanish words Piedras Negras translate as "black rocks" – a reference to the coal deposits that exist in the area.

Sightseeing
Piedras Negras' main tourist attractions are: the ruins of San Bernardo Mission (XVIII century), De La Ventana Caverns, Mercado Zaragoza, known simply as El Mercado - a folkloric commercial centre where one is able to buy a variety of original arts and crafts from the state, Plaza de las Culturas - a new park completed in 2005. The Plaza is a homage to Mexico's three main indigenous cultures: Aztec, Mayan, and Olmec. It features a replica of a pyramid representative of the style of each of the cultures, the biggest one being a replica of the Pyramid of the Sun, located in Teotihuacán near Mexico City.

Getting there
There are buses arriving here from Mexico City, Monterrey, Saltillo, Monclova and Cuartro Ciénegas.