This lagoon is located between Moron City and Jardines del Rey Tourist polo and is the largest natural reservoir in Cuba, with a surface area of 66 km2. It provides a haven for flamingos and a variety of other bird species as Tocororo, carpintero churroso, Mayito de Ciénaga, cernícalo, aura tiñosa, zunzún, martín pescador, falcón, gavilán del monte, and some migratory as huyuyo duck.

This lagoon is located on the way to Cayo Coco and is navigable across its 4.5 km² surface. It boasts beautiful natural canals, flanked by a dense forest of mangroves. The International Trout Center is located in this lagoon, due to the fact that it is one of the largest reservoirs for this species on the Island. 

In a former settlement of coal workers and with horse riding trails, rural festivals and a path with a low level of difficulty. Three ecosystems can be seen: evergreen forest, mangrove forest and inland lagoons with their respective fauna.

This is the second largest in the world, exceeded only by the Great Barrier Reef in Australia. Enjoy snorkeling in the coral reef and look the different sea species living at the reef. Its 24 dive sites are ideal for scuba diving and underwater photography.