Hang Ken, only recently surveyed, is 3.8 kilometers long. Hang Son
Doong, in Phong Nha-Ke Bang National Park in Vietnam, is believed by
many to be the largest cave on earth. It is more than four kilometers
long, with a continuous passage as wide as 90 meters, and, in places,
well over 180 meters high—spacious enough to accommodate an entire New
York City block of 40-story buildings. It is part of a system of 150 or
so caves, many still not surveyed, under the Annamite Mountains, formed
two to five million years ago, when river water scoured a tunnel along a
fault in the limestone.
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