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Cave of Swallows
The Cave of Swallows , also called Cave of the Swallows ((スペイン語:Sótano de las Golondrinas)), is an open air pit cave in the Municipality of Aquismón, San Luis Potosí, Mexico. The elliptical mouth, on a slope of karst, is 49 by 62 m wide and is undercut around all its perimeter, further widening to a room approximately 303 by 135 meters (994 by 442 ft) wide.〔 The floor of the cave is a 333-meter (1092 ft) freefall drop from the lowest side of the opening, with a 370-meter (1,214 ft) drop from the highest side,〔 making it the largest known cave shaft in the world, the second deepest pit in Mexico and perhaps the 11th deepest in the world. A skyscraper such as New York City's Chrysler Building could easily fit wholly within it.
==History==
Opened up by water erosion in a fault on an impermeable limestone plain and with a roughly conical shape, the cave has been known to the local Huastec people since ancient times. The first documented exploration was on 27 December 1966 by T. R. Evans, Charles Borland and Randy Sterns.〔
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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