Exploring Son Doong-the World’s Largest Cave

Son Doong

Ever wonder what it’s like on another planet? or what it would be like to visit an entirely new world? If so, then Son Doong cave is the perfect place for you to visit. This gigantic cave system is a whole new world with its own thriving ecosystem. Son Doong or more popularly known as Han Son Doong is the largest natural cave in the world. Recently discovered in 1990 by a local man, Han Son Doong is now a certified UNESCO Protected Site. 

Exploring Son Doong


The cave is situated inside Phong Nha-Ke Bang National Park in the Quang Binh district of Vietnam near the Lao-Vietnam border.

History and Discovery

Son Doong cave is estimated to be around 3 million years old. So, it is technically still considered a “young” cave. After its discovery by Ho Khanh, it was forgotten for a while. Only after he told his stories to two cave explorers, Howard Limbert and Deb Limbert, was the cave rediscovered. The two cave explorers advised Ho Khanh to search for the cave again and in 2008 it was rediscovered again by Ho Khanh. In 2009, he led a team of experts British Cave Research Association to the cave which included Howard and Deb Limbert.

Size of the Cave

The cave is over 5 km long, with some parts of the cave as big as 200m tall and 150 m wide. The cave is said to be big enough to house an entire airport. There is also a subterranean river running through it. It was discovered in 2019 that the river connected Son Doong with Hang Thung, a nearby cave which could mean that the whole cave could be even bigger than previously thought. The remarkable cave is so large that it has its climate with clouds forming above the river.

The Great Wall of Vietnam

 The size and splendor of Son Doong are quite impressive. The cave system is nearly 9 km long and with some sections as high as 200 m. . When it was first traversed, the explorers had a difficult time getting over the walls, so they gave it the nickname ‘The Great Wall of Vietnam’. 

Garden of Eden

The cave has a diverse ecosystem with a completely untouched underground forest. The forest has a variety of flora and fauna with monkeys and snakes, birds, etc. Many new species were discovered here and many more are yet to be found. This is why experts call the forest inside Son Doong, the Garden of Eden.

Cave Pearls

Son Doong is well known for its big cave pearls. Cave pearls are formed in the same way as ocean pearls are formed. When a nucleus, which can be anything from a tiny piece of mud, wood, or a grain of sand, is evenly coated in a concentric layer of calcite. Normally, cave pearls are 1 cm in size but the ones found at Son Doong are huge. The pearls are as big as the size of a fist. 

Stalagmite and stalactite

The world’s largest cave boasts of some of the tallest stalagmites and stalactites ever recorded. The stalagmites are as tall as 80 m and are a sight to behold. Even the stalactite hanging down from the cave ceiling gives off an ethereal alien world vibe. 

How to visit

Tourists were not allowed to visit until 2013. And the reason is that the environment inside the cave is very fragile and if people flock there, the fragile environment could easily be disrupted leading to the collapse of the unique ecosystem of Son Doong. So, keeping in mind the conservation of the cave, only 1000 visitors are allowed throughout the year.

There is only one tour operator allowed to give tours of this massive cave, Oxalis Adventure. To protect the cave from degradation ten people per tour are permitted. Each trip is supervised by only one operator. And because of flood risk, tours are only done from January to August. 

For this tour, it is essential to be physically fit and have experience in climbing and trekking. Permits are also needed for this adventure. If you want to join this adventure you can apply for your Vietnam visa online or visit the nearest Vietnamese Embassy. If you are from Bulgaria, you can apply for a visa here.

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