Son Doong Cave |
Son Doong Cave has been recognized as the largest of its kind in the world by three international organizations, including Guinness (based in the UK), the Association World Record (based in Hong Kong) and World Kings (based in the U.S. and India).
The cave is located in the heart of Phong Nha - Ke Bang National Park in Quang Binh province. Son Doong was discovered by a local in 1991. It was first explored in 2009 by the British Cave Research Association and has been open to the public since 2013.
The 1,645m-long cave system, which extends through a mountain, was named one of the most captivating caves on earth by National Geographic.
Geologists say the cave formed two to five million years ago. It is roughly 6,5km long, 200m high and 150m wide.
By Thuy Dung