Input (grade 13): The peninsula comprises the Mexican states of Yucatán, Campeche, and Quintana Roo; the northern part of the nation of Belize; and Guatemala's northern department of El Petén.
Output (grade 12): The peninsula is covers up the Mexican states of Yucatán, Campeche, and Quintana Roo; the northern part of Belize; and Guatemala's northern department of El Petén.