Phong Nha–Kẻ Bàng National Park
UNESCO-listed limestone wilderness in Quảng Bình holding the world's largest cave, Sơn Đoòng, and dozens of accessible show caves.
Phong Nha–Kẻ Bàng is the country's most extraordinary national park: 885 km² of karst studded with the longest cave system in Asia, including Sơn Đoòng — the largest cave on the planet by volume.
What it is
A UNESCO World Heritage site (since 2003, expanded 2015) protecting Permian-Carboniferous limestone, primary forest, and over 400 documented caves. The park sits in the centre-north's Trường Sơn range, 50 km inland from Đồng Hới on the central coast.
What to see and do
- Sơn Đoòng — 4-day expedition with Oxalis, the only permitted operator. $3,000.
- Hang Én — third-largest cave globally, 2-night camping trek with Oxalis, $370.
- Paradise Cave (Thiên Đường) — 7 km show cave with boardwalk to 1 km, family-friendly.
- Phong Nha Cave — the original boat-access cave, 1.5 km navigable river inside.
- Dark Cave (Hang Tối) — zipline + mud bath + kayak combo, the adrenaline option.
- Tu Làn cave system — outside the park boundary near Tân Hóa, 1–4 day Oxalis trips.
- Botanical garden / Nước Moọc spring — easy half-day for non-trekkers.
How to get there
Fly or train to Đồng Hới (DHO), then 50 km west to Phong Nha town. Vietnam Airlines, VietJet and Bamboo all fly Đồng Hới from Hanoi and HCMC for around $40–80 one-way. The Reunification Express stops here; the SE3 from Hanoi takes 9h overnight, soft sleeper around 750,000 VND.
From Đồng Hới: shuttle vans 120,000 VND, taxi 450,000 VND, or rent a scooter at the airport for 200,000 VND/day and ride yourself.
When to go
February–August is the workable window. Cave trekking is suspended September–November (and sometimes into December) when the underground rivers flood. Sơn Đoòng season runs January to August only. The sweet spot is March–May: dry, warm, jungle still green.
Cost and operators
| Activity | Operator | Price |
|---|---|---|
| Sơn Đoòng 4D3N | Oxalis | $3,000 |
| Hang Én 2D1N | Oxalis | $370 |
| Tu Làn 1D | Oxalis | $90 |
| Paradise Cave | self | 250,000 VND |
| Phong Nha Cave boat | self | 150,000 VND boat + 150,000 entry |
| Dark Cave combo | Jungle Boss / Phong Nha Adventure | 450,000 VND |
Oxalis (oxalisadventure.com) holds exclusive permits for the wilderness caves. Jungle Boss is the credible second operator for shorter Hung Thoòng and Ma Da trips. Both are based in Phong Nha town.
Practicalities
- Phong Nha town is small but has 30+ guesthouses; Easy Tiger and Nguyen Shack are the social-hostel reference points.
- Wet-season trips are physically harder — leeches, slippery limestone, longer days.
- Sơn Đoòng requires booking 6–12 months ahead and a fitness deposit; medical exam at sign-up.
- ATMs in town; cash for tipping porters (around $20/day pp).
Honest take
If you can afford Sơn Đoòng and you are fit, it is the most extraordinary trip in Vietnam, full stop. If not, Hang Én at $370 is 70% of the experience for 12% of the price. If you have a day and a scooter, Paradise + Phong Nha + Nước Moọc spring is a satisfying loop. The only mistake here is treating the park as a half-day box-tick — give it three nights.
Related: Sơn Đoòng expedition · Hang Én cave · Paradise Cave & Phong Nha · Phong Nha town · Phong Nha loop
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