The ecoregion is bounded on the south by a series of mountain ranges and highlands, including the Sierra Madre de Oaxaca, Sierra Madre de Chiapas, Chiapas Plateau, and Guatemalan Highlands, where the lowland Petén-Veracruz forests yield to montane moist forests and pine-oak forests. In central Veracruz, the Veracruz dry forests separate the Petén-Veracruz moist forests from the Veracruz moist forests further north. The western portion of the ecoregion mostly extends to the Gulf of Mexico, although the montane forests of the Sierra de los Tuxtlas and the flooded forests and wetlands of the Pantanos de Centla constitute distinct ecoregions.