- peninsula comprising SE Mexico, Belize, & part of W Guatemala: it separates the Gulf of Mexico from the Caribbean: c. 70,000 sq mi (181,299 sq km)also Yucatán (or Yucatan) Peninsula
- state of Mexico, on this peninsula: 15,189 sq mi (39,339 sq km); cap. Mérida
A peninsula mostly in southeast Mexico between the Caribbean Sea and the Gulf of Mexico. It includes many Mayan and Toltec sites and is separated from Cuba by the Yucatán Channel.