Hang Son Doong, the largest cave in the world in Vietnam

Hang Son Doong, the largest cave in the world in Vietnam. Son Doong Cave was discovered in 1990 in Phong Nha Kẻ Bàng National Park, Vietnam a UNESCO Heritage Site by a nearby farmer. However, it was not until 2009, during the British to Vietnam Cave Expedition, that the destination was officially surveyed and measured, leading to its recognition as the largest cave ever found. The cave stands 200 meters high, 150 meters broad, and is 9 kilometers long, with a scale capable of holding a 40 story building. The extraordinary and mysterious underground world within Son Doong is the reason for the cave's worldwide fame and renown. It has its own ecosystem, weather, and a mysterious underground river that no explorer has yet traced to its end, along with many complex and giant stalactites, over 80 meters high.