There are areas in Xel-Ha yet untouched, unexplored save by a precious few divers and scientific investigators. Xel-Ha is a part of the enormous anchialine system of the Yucatan Peninsula, surface manifestation of the meteor impact that caused the extinction of dinosaurs 65 million years ago. This system is formed by a series of interconnected lagoons, underwater caves and rivers, many reaching hundreds of meters in depth and many thousands in length.

A practically unexplored, profound underwater cave system rests below the Black Lagoon of Xel-Ha. This lagoon measures approximately 110 meters long and 30 meters wide at its broadest point –the magnificent scenery set for another of Xel-Ha’s adventures –kayaks.