Matamoros is a city located in the southwestern part of the Mexican state of Coahuila; it serves as the seat of the surrounding municipality of the same name. It lies directly east of the larger city of Torreón and is a part of the Comarca Lagunera, a larger metropolitan area that includes the municipality of Torreón in Coahuila in addition to the municipalities of Gómez Palacio and Lerdo in the adjacent state of Durango.