Riviera Maya, also known as the Mayan Riviera is located on the eastern portion of the Yucatan Peninsula. A major attraction throughout the Riviera Maya are coastal and reef aquatic activities dependent on the coastal water and the Mesoamerican Barrier Reef System (also known as the Belize Barrier Reef) which begins near Cancun and continues along the whole length of the Riviera Maya continuing southward to Guatemala. This barrier reef system is the second longest in the world. Other activities at the most visited locations include snorkeling, scuba diving, swimming in cenotes, swimming with dolphins, zip lining, sailing, and guided jungle tours.