Hidden 3-Kilometer Cave Filled With Rare ‘Cave Pearls’ Discovered in Vietnam’s UNESCO National Park

A newly discovered cave deep inside Vietnam’s famed Phong Nha – Ke Bang National Park is drawing attention for its extraordinary geological treasures, including one of the largest concentrations of rare cave pearls ever documented by local exploration experts.

The newly named Thang (Victory) Cave stretches approximately three kilometers beneath the limestone mountains of central Vietnam and could become the country’s next major destination for adventure tourism, pending conservation and ecotourism approval.

The discovery was made after a local resident revealed the cave’s location to Jungle Boss, a leading adventure tour operator specializing in cave expeditions. In partnership with the management board of Phong Nha – Ke Bang National Park, the company conducted a six-day expedition earlier this month to survey the untouched cavern.

Located in the protected Ma Da Valley between Elephant Cave and Ma Da Lake, Thang Cave features an immense underground landscape with an average width of 70 meters, while several chambers exceed 100 meters across. Explorers reached the cave floor by descending approximately 20 meters on ropes before entering a vast network of passages adorned with spectacular limestone formations.

Inside, the team documented towering stalactites and stalagmites formed over hundreds of thousands of years. Some natural stone columns rise as high as 50 meters, while flowing rock curtains and other intricate mineral formations line much of the cave’s interior.

The expedition’s most remarkable discovery, however, was an exceptional abundance of cave pearls—rare spherical mineral deposits created as layers of calcite gradually build around tiny particles in shallow pools over thousands of years. According to Jungle Boss, even veteran cave explorers rarely encounter such a dense concentration of these delicate geological formations.

The cave was named after the local resident who first identified its location, highlighting the important role local communities continue to play in uncovering Vietnam’s hidden natural heritage.

Following the successful survey, Jungle Boss has proposed adding Thang Cave to its existing two-day, one-night Ha Ma Da Valley and Tra Ang Cave adventure route. The proposal has already received preliminary approval from the national park’s management board.

Recognized by UNESCO as a World Natural Heritage Site, Phong Nha – Ke Bang is home to some of the planet’s most spectacular karst landscapes, including Son Doong, the world’s largest cave. The discovery of Thang Cave further reinforces the park’s reputation as one of Asia’s premier destinations for cave exploration and nature tourism.

With its untouched ecosystem, dramatic limestone formations, and rare cave pearls, Thang Cave could soon become another must-see attraction for international adventure travelers seeking to explore one of Vietnam’s most remarkable natural wonders.