It is the 3rd largest city in Mexico with the most civil and religious historical buildings. It is located in the north-central region of the country and occupies a wide area of the Mexican plateau. Its official name is Free and it is in the Sovereign State of San Luis Potosi and its land area of 63,068 km is the fifteenth largest state in Mexico. It is located between 24 ° 22 'and 21 ° 07' north latitude and 98 ° 20 'and 102 ° 17' west longitude. It is bordered to the north by Coahuila and Nuevo Leon, Tamaulipas to the northeast, east to Veracruz, southeast Hidalgo, south to Queretaro and Guanajuato, Zacatecas to the west and southwest by Jalisco.