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The Mexican state of San Luis Potosí has an area of 24,266 square miles (62,849 km˛). It is in the north-central part of the Mexican republic, It borders Coahuila to the north, Nuevo Leon to the north-east, Tamaulipas to the east, Veracruz to the east, Hidalgo, Queretaro, and Guanajuato to the south,and Zacatecas to the north-west.

The state lies mostly on the Mexican Plateau, with the exception of the southeastern corner of the state, where the tableland breaks down into the tropical valley of the Panuco River. The surface of the plateau is comparatively level, with some low mountainous wooded ridges. The Sierra Madre Oriental runs north and south through the state, and separates the Mexican Plateau from the Gulf Coastal Plain to the east. The Sierra Madre Oriental is home to the Sierra Madre Oriental pine-oak forests. The Panuco River originates on the Plateau, and flows eastward through a gap in the Sierra Madre to drain into the Gulf of Mexico. The easternmost portion of the state lies on the Gulf Coastal Plain, and covered by the Veracruz moist forests.

The state lies mostly on the Mexican Plateau, with the exception of the southeastern corner of the state, where the tableland breaks down into the tropical valley of the Panuco River. The surface of the plateau is comparatively level, with some low mountainous wooded ridges. The Sierra Madre Oriental runs north and south through the state, and separates the Mexican Plateau from the Gulf Coastal Plain to the east. The Sierra Madre Oriental is home to the Sierra Madre Oriental pine-oak forests. The Panuco River originates on the Plateau, and flows eastward through a gap in the Sierra Madre to drain into the Gulf of Mexico. The easternmost portion of the state lies on the Gulf Coastal Plain, and covered by the Veracruz moist forests.