What two regions are part of the Mexican Cultural regions of North America

There aren't just two, there are actually nine. Mexico can be divided into nine major physio-graphic regions: Baja California, the Pacific Coastal Lowlands, the Mexican Plateau, the Sierra Madre Oriental, the Sierra Madre Occidental, the Cordillera Neo-Volcánica, the Gulf Coastal Plain, the Southern Highlands, and the Yucatán Peninsula.