Here’s another reason to go to Vietnam: It’s a wonderland for people who like caves. View photos of some of its most beautiful, biggest caves, including Hang Tien and Hang En.
Hidden beneath the lush jungles of central Vietnam lies a deep subterranean labyrinth that holds three of the world’s four biggest caves.
You won’t bump your head in the caves of central Vietnam’s Quang Binh province. Not when they’re big enough to fit a 40-storey building.
Three of the world’s four biggest caves are in this skinniest part of the slender nation. Hundreds of other limestone caves housing deep grottoes and underground rivers are here too, with new caverns discovered every year. They’re welcome news for this area, just north of the demilitarised zone that split North and South Vietnam from 1954 until 1975. The US bombed here extensively during the Vietnam War (one crater is used as the site of an outdoor bar), and poverty hit hard for more than a decade afterwards. Continue at Source: Vietnam’s vast underground world
During a dive last month, a British team discovered an underwater tunnel connecting the largest cave, Son Doong, in Vietnam, with another gigantic cave, called Hang Thung. Once the caves are officially connected, it will measure an estimated 1.4 billion cubic feet.
“It would be like someone found a lump on top of Mount Everest, making it another 1,000 meters higher,” Howard Limbert, one of the organizers of the dive, told CNN Travel. “Any cave in the world will be able to fit comfortably inside Song Dong when it’s connected — it’s just outrageous in size.”