The city of Allende is located at , at a height of above sea level. It straddles Federal Highway 57, with state capital Saltillo some away to the south, while the international border crossing at Piedras Negras, Coahuila (across the Río Bravo del Norte from Eagle Pass, Texas, United States) is some to the north. Allende is also crossed by the railway that connects Saltillo to the border city of Ciudad Acuña (across the river from Del Rio, Texas, United States).