Mesoamerican Barrier Reef System
The Mesoamerican Barrier Reef System, also known as the Mesoamerican reef, stretches over ,1000 km from Isla Contoy at the tip of the Yucatán Peninsula down to the Bay Islands of Honduras. The reef system includes various protected areas and parks including the Belize Barrier Reef, Arrecifes de Cozumel National Park, Hol Chan Marine Reserve, Sian Ka'an biosphere reserve, and the Cayos Cochinos Marine Park. This reef structure is the largest coral reef in the Western Hemisphere and the second largest barrier reef in the world.
The reef system extends along the coast of four countries: Mexico, Belize, Guatemala, and Honduras. It begins near Isla Contoy on the northern tip of the Yucatán Peninsula and continues south alongside the Riviera Maya including areas like Cozumel and Banco Chinchorro. It then continues south down the eastern coast of Belize including many cayes and atolls. It extends past the north-east corner of Guatemala and ends near the Bay Islands of Honduras.
It is site of several open water swims and triathlons, including the Maratón Acuático Ruta del Arrecife.