Tulum (Yucatec: Tulu'um) is the site of a Pre-Columbian Maya walled city serving as a major port for Cobá. The ruins are situated on 12-meter (39 ft) tall cliffs, along the east coast of the Yucatán Peninsula on the Caribbean Sea in the state of Quintana Roo, Mexico. Tulum was one of the last cities inhabited and built by the Mayans, it was at its height between the 13th and 15th centuries and managed to survive about 70 years after the Spanish began occupying Mexico. Old World diseases brought by the Spanish settlers appear to have been the cause of its demise. One of the best-preserved coastal Maya sites, Tulum is today a popular site for tourists.

The Maya site may formerly have been known by the name Zama, meaning City of Dawn because it faces the sunrise. Tulum stands on a bluff facing east towards the Caribbean Sea. Tulúm is also the Yucatan Mayan word for fence, wall or trench, and the walls surrounding the site allowed the Tulum fort to be defended against invasions. Tulum had access to both land and sea trade routes, making it an important trade hub, especially for obsidian. From numerous depictions in murals and other works around the site, Tulum appears to have been an important site for the worship of the Diving or Descending god. Tulum had an estimated population of 1,000 to 1,600 inhabitants.