Phong Nha Cave extends 7,729 meters into the limestone mountains of central Vietnam. As you float along its underground river, you'll pass through 14 ancient grottoes where stalactites hang like stone curtains from 25-meter-high ceilings. Look for the 3-meter lion formation and ancient Buddha figures carved by water and time. The cave sits within Phong Nha-Kẻ Bàng National Park, alongside Son Doong - the world's largest cave - and hundreds of other limestone chambers.
Exploring Phong Nha Cave
The cave mouth opens directly onto the Son River, where wooden boats carry visitors 1,500 meters into the limestone mountain. Start at the tourist center in Phong Nha town, where each boat holds up to 14 people and costs 360,000 VND. As you glide deeper, natural light dims and electric lamps illuminate the rock walls. While the underground river runs nearly 14 kilometers, visitors can access only the first section.
Rock Formations and Cave Features
Minerals and water have carved the cave's interior for millions of years. A 3-meter limestone formation stands in the shape of a seated lion, while other rocks resemble Buddha figures. Look for the collection of stalagmites that local guides compare to an ancient royal court. The 25-meter-high ceilings create deep chambers where underground lakes mirror the rock formations above.
Getting to Phong Nha Cave
Daily flights connect Dong Hoi Airport with Hanoi and Ho Chi Minh City. The cave lies 45 kilometers from the airport. Local buses run hourly between Dong Hoi and Phong Nha town from 5am to 5pm (except noon), taking 45-90 minutes. A taxi ride costs around 400,000 VND.
When to Visit
Visit between February and August when rainfall stays low. The cave system can flood during the wet season (September to November), sometimes forcing tour cancellations. Schedule early morning visits to explore before larger tour groups arrive.
Beyond Phong Nha Cave
The national park contains over 500 caves, with about 30 open to visitors. Paradise Cave stretches 31 kilometers underground, with elevated walkways covering its first kilometer. At Dark Cave, you can zip-line across the river and swim in natural mud baths. Tu Lan cave system welcomes adventurers on multi-day expeditions, where you'll swim through underground rivers and camp in the jungle.