Coahuila (Spanish pronunciation: [koaˈwila] (listen)), formally Coahuila de Zaragoza (American Spanish: [koaˈwila ðe saɾaˈɣosa] (listen)), officially the Free and Sovereign State of Coahuila de Zaragoza (Spanish: Estado Libre y Soberano de Coahuila de Zaragoza), is one of the 32 states of Mexico.
Coahuila borders the Mexican states of Nuevo León to the east, Zacatecas to the south, and Durango and Chihuahua to the west. To the north, Coahuila accounts for a 512 kilometres (318 mi) stretch of the Mexico–United States border, adjacent to the U.S. state of Texas along the course of the Rio Grande (Río Bravo del Norte). With an area of 151,563 square kilometres (58,519 sq mi), it is the nation's third-largest state. It comprises 38 municipalities (municipios). In 2020, Coahuila's population is 3,146,771 inhabitants.
The largest city and State Capital is the city of Saltillo; the second largest is Torreón (largest metropolitan area in Coahuila and 9th largest in Mexico); the third largest is Monclova (a former state capital); the fourth largest is Ciudad Acuña; and the fifth largest is Piedras Negras.