Piedras Negras is a very small farming community of only 143,915 people, of which 71,489 are men and 72,426 are women. Growth is low and stabile, reflecting its remote location and agrarian composition. Eagle Pass, Texas, sister city to Piedras Negras, has 20,651 inhabitants; Maverick County holds 36,378.

Coahuila de Zaragosa, third largest Mexican state after Chihuahua and Sonora, occupies the US - Mexico border across from West Texas in the middle portion of the Rio Grande River. It consists primarily of a vast rolling plateau traversed by several ranges of hills. The climate is predominantly hot and arid, and the only fertile land is found in valley and depression, and is artificially irrigated. The capital city of Coahuila is Saltillo.

Piedras Negras sits on flat and rolling terrain near the banks of the Rio Grande River. The climate is hot and humid almost the entire year. The region experiences heavy rains at times, and is affected by the Gulf Streams and the hurricane season in South Texas.

• 54 miles to Acuna, Coahuila
• 223 miles to Austin, Texas
• 626 miles to Chihuahua, Chihuahua
• 403 miles to Dallas, Texas
• 302 miles to Houston, Texas
• 285 miles to Monterrey, Nuevo Leon
• 117 miles to Nuevo Laredo, Tamaulipas
• 288 miles to Saltillo, Coahuila
• 356 miles to Torreon, Coahuila