Looking for extra information about Son Doong Cave? You found it!
The biggest known cave in the world simply deserves her own page with extra information. Read how the Son Doong Cave was first discovered, get to know something about the geology, the size and about the nearest ethnic village: Ban Doong.
How was Son Doong Cave first discovered?
From an early age, local man Ho Khanh used to spend weeks on end trekking and maneuvering his way through the jungles of the Phong Nha-Ke Bang National Park, searching for food and timber to earn a modest income. In 1990 while out on a hunting mission, Ho Khanh stumbled across an opening in a limestone cliff and moved forward to investigate. As he approached he noticed clouds billowing out of the entrance, and could hear the sounds of a river raging from somewhere inside the cave.
When he could feel a strong wind also blowing out from the cave, he decided to move on without further inspection. By the time he had returned to his home a few days later, he had forgotten its exact location and thought no more of it. At the same time two members of the British Cave Research Association (BCRA), Howard and Deb Limbert, were basing themselves in Phong Nha to conduct exploratory cave expeditions in the area. While chatting with Ho Khanh one day, he mentioned to the caving experts that he had found a cave with clouds and a river inside. Howard and Deb were intrigued and urged Ho Khanh to try and rediscover the cave. After many failed attempts, they began to think this elusive cavern might remain lost in the jungle forever more. In 2008 while out on another food gathering trip, Ho Khanh found the mysterious opening again and studiously took note of the path on how to get there. In 2009 he led Howard, Deb and a team of professionals back to the cave for the first expedition to enter what would later become known as Hang Son Doong, or ‘Mountain River Cave’.
Geology of Son Doong Cave
The Phong Nha-Ke Bang National Park in Vietnam contains the oldest karst system in Asia, between 400-450 million years old. Hang Son Doong itself is relatively young, with the analysis of sediment dating it to be only 3 million years old. Formed on the edge of a fault zone, Hang Son Doong has been carved out by the mighty Rao Thuong River as it erodes away the limestone, forming the enormous tunnel beneath the Annamite Mountains. Giant sinkholes, known as dolines, have collapsed sometime up to 300’000 years ago, creating massive openings to the outside world. Cave pearls the size of baseballs have been formed by water dropping from the ceiling.
How big is Son Doong Cave?
The first expedition had been halted by an 80m high calcite barrier, which was jokingly dubbed the ‘Great Wall Of Vietnam’. It wasn’t until their second expedition in 2010, when the Great Wall was finally climbed and the end of the passage was found, that Hang Son Doong was determined to be the largest cave in the world. At over 5km long, with sections reaching up to 200m tall and 150m wide, Hang Son Doong is large enough to house an entire New York City block, complete with 40 story skyscrapers. With a total measured volume of 38.5 million cubic metres, this comfortably surpasses Deer Cave in Malaysia, which was considered to be the previous record holder. Stalagmites up to 80m high have also been surveyed, the tallest every encountered.
Ban Doong ethnic village
To reach Hang Son Doong, adventurers must first pass through the Ban Doong ethnic minority village. The only village located inside the Phong Nha-Ke Bang National Park, less than 40 people makes up the population of Ban Doong. Life is tough for the minority people here, due to their isolation from the outside world. Access is only possible by foot, and the dense jungles surrounding Ban Doong prohibit the cultivation of most crops. The discovery of Hang Son Doong and the subsequent expeditions that now pass through the village have seen new opportunities arise for the community, who now can earn extra income by working closely with Oxalis to protect the conservation of the area. For many people, being able to visit Ban Doong and meet its welcoming villagers becomes a highlight of their trip. Ban Doong offers a view of way of life that has been unchanged for centuries.
7 days & 6 nights starts from $ 3000 | $ 428 per day
Incl: + transfers + private tour + camping gear + safety gear + English speaking guide + trekking +meals
Our Son Doong Cave Expedition will take you into the heart of Phong Nha Ke Bang National Park in Quang Binh Province, Vietnam, on one of the most thrilling adventure tours in the world. Our Son Doong Expedition is available with weekly departures. It is advised to book in advance as this is a popular tour and we are strictly limited to 10 guests per departure.
With your team of more than 25 porters, safety experts and guides, and over six days you’ll explore the entire length of Son Doong Cave, Hang En Cave as well as visiting the Ban Doong ethnic minority village deep in the jungle.