Which part of Mexico is Tulum in?

Yucatán Peninsula
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.

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Is Tulum in Cancun?

Tulum ruins are located 130 km south of Cancun and is considered by many as the most beautiful of the Mayan Ruins sites around Cancun, is small but exquisitely poised on the fifteen-meter-high cliffs above the azure waters of the Caribbean Sea. Tulum has one of the most beautiful beaches in the Caribbean.