Original: As the largest sub-region in Mesoamerica, it encompassed a vast and varied landscape, from the mountainous regions of the Sierra Madre to the semi-arid plains of northern Yucatán.
Simplified: As the largest sub-region in Mesoamerica, it includes a vast and varied landscape, from the mountainous regions of the Sierra Madre to the semi-arid plains of northern Yucatán.