The cove of Xel-Há is not only an entrance of the sea to the interior of the continent, but also the mouth of several fresh water channels that make up the longest system of underground rivers in the world.
The cove itself is a unique adventure, swimming or snorkeling you get to see more than 400 species of plants, animals and fish of different colors and sizes that live freely in this protected ecosystem. This place of gentle currents is home to more than 90 species of fish, including angelfish, parrotfish, surgeonfish, the spotfin butterflyfish, sergeant major, balloon fish, snapper, damselfish and even barracudas. The queen conch is a protected specie that also inhabits this place and which is under careful monitoring by specialists dedicated to their protection and conservation. Turtles and manatees also inhabit the lagoon.