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cenote
A cenote ( or ) is a natural pit, or sinkhole, 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.
==Definition and description==
Cenotes are surface connections to subterranean water bodies.〔 While the best-known cenotes are large open water pools measuring tens of meters in diameter, such as those at Chichén Itzá in Mexico, the greatest number of cenotes are smaller sheltered sites and do not necessarily have any surface exposed water. The term cenote has also been used to describe similar karst features in other countries such as Cuba and Australia, in addition to the more generic term of sinkholes.〔
Cenote water is often very clear, as the water comes from rain water filtering slowly through the ground, and therefore contains very little suspended particulate matter. The groundwater flow rate within a cenote may be very slow. In many cases, cenotes are areas where sections of cave roof have collapsed revealing an underlying cave system, and the water flow rates may be much faster: up to per day.〔 Cenotes around the world attract cave divers who have documented extensive flooded cave systems through them, some of which have been explored for lengths of or more.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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