cenote zaci - valladolid, mexico: is a natural sinkhole, resulting from the collapse of limestone bedrock that exposes groundwater

activity adventure beauty blue cancun cave cavern caving cenote cenotes dive diver erosion exploration formation geologic lagoon lake landscape light mayan mexican mexico mountain mystery national natural nature park passage rays roo speleology stalactite stalagmites stone swim tourism tourist travel trip tulum tunnel under underground underwater view water