- Where
- On the Son River in north-central Vietnam, about 45 km north-west of the coastal city of Dong Hoi, 210 km north of Hue and 480 km south of Hanoi.
- Known as
- The kingdom of caves. Phong Nha – Ke Bang National Park protects a limestone massif about 400 million years old, one of the oldest and largest karst landscapes in Asia.
- UNESCO
- A World Heritage site since 2003, extended in 2015. In July 2025 UNESCO added the adjoining Hin Nam No National Park in Laos, which makes this Vietnam's first World Heritage site shared across a border.
- The big one
- Son Doong, first surveyed in 2009, is the largest cave passage in the world: more than 5 km long, with sections 200 m high and 150 m wide, and a volume of about 38.5 million cubic metres.
- On the map
- Phong Nha has been in Quang Tri province since 1 July 2025. Before that it was in Quang Binh, which is what most guidebooks, bus companies and booking sites still say.
- Getting there
- Fly or take the train to Dong Hoi, then it is about an hour by taxi, hotel shuttle or local bus. Buses and limousine vans run from Hue in about 4 hours, and night buses come from Hanoi and Ninh Binh.
- Getting around
- The village is one main street: walk or cycle. The caves are 20–30 km away inside the park, so join a day tour, hire a car, or ride behind a local driver.
- Best time
- February to August. March to May is the most comfortable; June to August is hot but dry. From mid-September to November heavy rain floods the rivers and caves close, sometimes for weeks.
- How long
- Two or three days for the main caves. Add two to five days if you book an expedition.