noun - Cenote is a natural pit, or sinkhole or underwater caves, resulting from the collapse of limestone bedrock that exposes groundwater underneath. Especially associated with the Yucatán Peninsula of Mexico, cenotes were sometimes used by the ancient Maya for sacrificial offerings.
The term derives from a word used by the low-land Yucatec Maya — ts'onot — to refer to any location with accessible groundwater. Cenotes are common geological forms in low latitude regions, particularly on islands, coastlines, and platforms with young post-Paleozoic limestones that have little soil development.
Some have multiple layers of fresh water, seawater, stalagmites and stalactites and even trees. Many remain undiscovered and their depths unexplored.