Also known as Son Thuy Cave. It was once selected by the media as one of the three most beautiful attractions in Vietnam. Son Thuy Cave is the largest known underground cave in the world and is believed to be at least two to five million years old. Surprisingly, this huge cave has remained hidden from the world until 2009, when Vietnam opened up to international tourists to adventure here.
Advance booking is essential. Son Thuy Cave is a huge cave. There are underground rivers, dense jungles and various diverse creatures inside. People can even camp here overnight. It stretches for more than 5 kilometers.