Parque marino nacional Sistema Arrecifal Veracruzano

The Veracruz Reef System (Sistema Arrecifal Veracruzano) is a group of coral reefs off the coasts of Veracruz, Boca del Río, and Antón Lizardo, declared a marine national park in 1992. It is the largest coral reef system in the Gulf of Mexico.

Do not confuse it with the Mesoamerican Reef, which lies in the Caribbean Sea off Quintana Roo; this question asks about the Gulf side of the country.