The Great Wall of Viet Nam is a stalagmite wall of nearly 100 meters high near the end of Son Doong, which is the world’s largest cave in the central province of Quang Binh. Photos credit: Ryan Deboodt
The wall is six kilometers deep into the cave and has been praised by explorers as a masterpiece of nature.
Tourists have to use special equipment and closely follow experts’ instructions if they want to conquer the wall.
A sand bubbler crab in the cave.
Fossilized goat bones from several hundred years ago.
Beyond the wall is another 600 meters of the cave and the exit.