Tulum is the site of a pre-Columbian Mayan walled city which served as a major port for Coba, in the Mexican state of Quintana Roo. The ruins are situated on 12-meter-tall cliffs along the east coast of the Yucatán Peninsula on the Caribbean Sea. Tulum was one of the last cities built and inhabited by the Maya and achieved its greatest prominence between the 13th and 15th centuries.