Photo: World's Longest Underground River Discovered in Mexico,

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A cenote, or sinkhole, called Calimba offers an entrance—and a window—into the Yucatán Peninsula's underground limestone caverns.

A pair of divers says that they have mapped the world's longest underground river in the caves—a twisting, turning waterway 95 miles (153 kilometers) in length.

Photograph by Steve Bogaerts

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