In the World Heritage Phong Nha–Ke Bang National Park in central Vietnam, a new cave about 3 km in total length was found. The exploration company Jungle Boss conducted a six-day field survey based on information from local resident Thanh, and it's named "Thang (Victory) Cave" after the discoverer. What's of note is that round, smooth, pure-white "cave pearls" were found in dense clusters. Another candidate for a superb view is added to this park, known for Son Doong Cave. For Japanese hidden-gem lovers, we organize from a practical angle where the "cave no one has toured yet," which you could aim for on your next trip, is and when you can go.
How the 3-km new "Thang Cave" was found
The trigger was that on June 3, 2026, local resident Thanh conveyed the location of the cave entrance to the national park side. The exploration company Jungle Boss surveyed it over six days in coordination with the park management board, confirming it to be a cave of about 3,000 m in total length, about 70 m in average width, and multiple chambers exceeding 100 m in scale. The location is within the "strict protection zone" in the Ma Da Valley, between the Voi (Elephant) Cave and Ma Da Lake.
It's customary for a cave's name to be decided first and then for surveying to proceed, but this time the discoverer's name became the cave's name as is. Thanh's name, meaning "victory," appears to symbolize the hard-won result.
What's new — the dense cluster of white "cave pearls"
Thang Cave's features aren't just the scale of stalactites and stalagmites. In addition to giant stone pillars (columns where stalactites connect to the floor) reaching up to 50 m from the floor, and flowing stone-curtain-like terrain, many "cave pearls" collected in rock hollows were found. Cave pearls are spherical mineral bodies formed as minerals carried by water droplets deposit in layers over a long time around a core such as a grain of sand. The Jungle Boss side explains that even experienced cave explorers rarely encounter cave pearls of such high density.
In other words, this isn't a story of "one more giant cave being added"; the essence this time is that a rare type of highlight even among Vietnam's limestone caves was added.
Seeing the scale and structure in numbers
We've put only the figures we could back up into a table. These are values consistent across multiple outlets.
| Item | Details |
|---|---|
| Total length | About 3,000 m (about 3 km) |
| Average width | About 70 m |
| Large spaces | Multiple chambers over 100 m |
| Stone-pillar height | Up to about 50 m from the floor |
| Main entrance size | About 5 square meters (with spots where even one adult can barely pass) |
| Descent to the floor | About 20 m by rope |
| Survey days | 6 days (information received June 3) |
With a small entrance of about 5 square meters and spots where adults can pass only one at a time, while inside a vast space of 70-m-class width spreads out — this "gap between the narrow entrance and the wide interior" is a structure typical of Phong Nha–Ke Bang's limestone caves. You need to descend about 20 m by rope to the floor, so it's not a place just anyone can casually enter.
Different from the 06-22 Quang Tri cave — how they differ
A little while ago on this site we covereda new cave found by chance in Quang Tri. Since it's easy to confuse with this Thang Cave, we organize the differences.
What's complicated is the matter of administrative divisions. In the regional reorganization of July 2025, the former Quang Binh province, where Phong Nha–Ke Bang was, was merged with the former Quang Tri province, and both are now the new "Quang Tri province." That's why reporting notates this cave too as "Quang Tri province," but the location is the karst zone of the former Quang Binh known for Son Doong Cave — that is, within the World Heritage Phong Nha–Ke Bang National Park.
- How it was discovered — last time it was a chance discovery, this time a planned survey based on information from local resident Thanh
- The highlight — this time the rare feature of "a dense cluster of white cave pearls" is the star
- Positioning — this time it's inside the World Heritage Phong Nha–Ke Bang, and turning it into a tourism route is already being discussed
Even the same "new Quang Tri cave" is entirely different in substance. Reading both side by side reveals how actively cave surveying is progressing in central Vietnam's karst zone.
How locals and the exploration industry take it
The exploration side, Jungle Boss, rates that even specialists rarely see cave pearls of such high density, and proposed to the park side incorporating it into a tourism route right after the survey.
It's reported that the park management board gave in-principle approval to a plan to incorporate Thang Cave into a two-day, one-night eco-tour route of "Ha Ma Da Valley – Tra Ang Cave." Locally, a favorable reaction to the discoverer's name remaining as the name of the tourism resource can also be seen.
On the other hand, given the conditions of a narrow entrance, a required 20-m descent to the floor, and being within a strict protection zone, some see development and safety management as taking time. It's not a place a large crowd will rush to immediately — that's the realistic read.
Implications for Japanese hidden-gem lovers and travelers
"When can I go" is likely the biggest interest, but at present no public-opening schedule is decided. Turning it into a route is still at the in-principle-approval stage, with the coordination of facilities for securing safety and entry management remaining. Since new caves in Phong Nha–Ke Bang are sometimes prepared over a span of several years until opening, it's worth grasping that you can't book right now.
Still, Phong Nha–Ke Bang already has abundant cave tours you can experience. If, while waiting for Thang Cave to open, you experience "Vietnamese cave exploration" on existing routes run by exploration companies including the same Jungle Boss, it'll go smoothly when Thang Cave is eventually unlocked. The more you love hidden gems, the more it's worth grasping how to get in locally now, before the opening.
Ripple effects on tourism and the local economy
Phong Nha–Ke Bang is a region that has raised its international profile through exploration-type ecotourism, with Son Doong Cave, a "world-class largest cave," as its signboard. A flow where new routes are born from local residents' information, as with Thang Cave, and turned into tourism resources bearing the discoverer's name, creates new employment and guide demand for the region.
With the 2025 provincial merger and the expanded registration by UNESCO into a transboundary World Heritage site (Phong Nha–Ke Bang and Laos's Hin Nam No), this area is coming to be positioned as the core of wide-area tourism as "Quang Tri province's green heritage." The discovery of the new cave can be called concrete news backing that flow.
Practical information — how to get to Phong Nha and the surroundings
The general access to Phong Nha–Ke Bang is via Dong Hoi in central Vietnam as the gateway. Flying to Dong Hoi by domestic flight from Hanoi or Ho Chi Minh City, then heading by car to the town of Phong Nha (Son Trach area), is the standard route. Since there are no direct flights from Japan, connecting through Hanoi or Ho Chi Minh City is realistic. As a currency-exchange guide, the rate is around 170 dong per yen (as of June 2026; it fluctuates, so confirm locally).
Cave exploration is easily swayed by weather, and in the rainy season (roughly September to November) tours may be canceled due to rising water. Aiming for the dry season stabilizes the viewing conditions inside the caves. If combining it with Vietnam travel destinations other than Phong Nha, please also refer to the following articles.
Summary — the next action
Thang Cave is a new hidden-gem candidate of Phong Nha–Ke Bang, about 3 km in total length with a dense cluster of white cave pearls. This cave, bearing the discoverer's name, has in-principle agreement to be incorporated into a two-day, one-night eco-tour route, and a future opening is expected, but the timing of public opening is still undecided. There are two concrete moves you can make now. One is to experience how to get in locally on Phong Nha's existing cave tours while waiting for the opening. The other isthe new Quang Tri cavecovered last time — reading it in comparison to grasp what's where in central Vietnam. It's well worth putting one Phong Nha into a dry-season itinerary.
