The Mayan Reef is the second largest in the world, after Australia. Only Mexico has more than 300 km (186 mi) of reef, that continue down along the coasts of Central American countries. The coral formations deposited in these shorelines are the most important part of the marine environment that gives life to this spectacular and unknown world. The reef is shaped also by other species that are almost just as important, like the tropical fish, dolphins, whale sharks that come in the winter, seaweeds and other organisms. One way to appreciate the marine world is to let yourself be seduced by activities such as snorkeling or scuba-diving. In this way you can get in touch with the magic of the underwater nature.