In 1991, a Vietnamese farmer stumbled upon a hidden cave entrance in Phon Nha-Ke Bang National Park, marked by the roar of water. Despite initial fear, he ventured inside and discovered a fascinating underground world with unique limestone formations.

The cave drew global attention, with scientists studying its minerals, fossils, and ancient artifacts. It remains a treasure within Phon Nha-Ke Bang National Park, attracting tourists eager to explore its stunning rock formations and labyrinthine corridors.
Soon Dong cave, explored by British researchers in 2009, is the world’s largest self-contained cave network, spanning 5 kilometers in length and 150 meters in width. It features diverse minerals, wildlife, and breathtaking formations shaped by millions of years of water erosion.