Yucatan, a peninsula in Central America dividing the Gulf of Mexico from the Caribbean Sea, and one of the few peninsulas of the world that extend northwards; is a flat expanse; has a good climate and a fertile soil, yielding maize, rice, tobacco, indigo, &c.; abounds in forests of valuable wood; forms one of the States of the Mexican Republic; it bears traces of early civilisation in the ruins of temples and other edifices.