The Yucatán Peninsula is a peninsula in North America. It separates the Caribbean Sea from the Gulf of Mexico. The peninsula is east of the Isthmus of Tehuantepec, a northwestern geographic divider, separating Central America from the rest of North America.
The peninsula covers the Mexican states of Yucatán, Campeche, and Quintana Roo; the northern part of Belize; and Guatemala's northern department of El Petén. Mexican states on the isthmus to the west of the peninsula include Chiapas and Tabasco.