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.

Published 2026-05-17· 7 min read· Vietnam Knowledge

Last reviewed: 21 May 2026Report outdated info

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.

Why visit phong-nha-ke-bang-national-park

Phong Nha–Kẻ Bàng offers what few places on Earth can match: the world's largest cave by volume, Sơn Đoòng, plus 400+ limestone formations ranging from boat-accessible show caves to multi-day trekking expeditions through virgin jungle. Whether you're a non-trekker drifting through Paradise Cave on a boardwalk or a hard-core explorer bivouacking underground for three nights, the park delivers a genuine wilderness experience just 50 km from the Quảng Bình coast. The geological drama is real — you're moving through Permian-Carboniferous stone 300 million years old, with collapsed cave ceilings large enough to shelter rainforest canopy.

When to go

Visit February–August; caves and jungle treks are closed or treacherous September–December due to monsoon flooding of underground rivers. The ideal window is March–May: warm, dry, minimal rainfall, and the jungle still verdant after winter. Sơn Đoòng expeditions operate January–August only and book out months ahead. Early morning departures from Phong Nha town are standard to maximize daylight underground; plan 3–4 nights minimum to avoid the tourist trap of a rushed half-day visit.

How to get there

Fly or train to Đồng Hới (DHO) — direct connections from Hanoi and HCMC cost $40–80 one-way on Vietnam Airlines, VietJet or Bamboo. The overnight Reunification Express (SE3) from Hanoi takes 9 hours, soft sleeper around 750,000 VND. From Đồng Hới, shuttle vans cost 120,000 VND to Phong Nha town (50 km west); taxis run 450,000 VND; scooter rental at the airport is 200,000 VND/day. Most visitors rent motorbikes or join guided tours from town.

What to see and do

Sơn Đoòng — 4-day / 3-night expedition with Oxalis (sole operator), $3,000 per person including porters, guides, camping kit. Legendary but requires peak fitness and 6–12 month booking window.
Hang Én — third-largest cave globally, 2-night tent camping trek, $370, half the price and intensity of Sơn Đoòng but still transformative.
Paradise Cave (Thiên Đường) — 7 km boardwalk show cave, entry 250,000 VND, family-friendly and manageable in 2–3 hours.
Dark Cave (Hang Tối) — zipline, mud bath and kayak combo, 450,000 VND, the adrenaline-focused option near Phong Nha town.
Phong Nha Cave — the park's original river cave, 1.5 km navigable by boat, 150,000 VND entry plus 150,000 VND boat hire; a spiritual prelude to the bigger caves.

Where to stay nearby

Phong Nha town has 30+ budget and mid-range guesthouses; Easy Tiger (backpacker hub, 150,000–250,000 VND dorm) and Nguyen Shack (social vibe, 200,000 VND) are the reference points. Mid-range hotels like Phong Nha Riverside (1.2 million VND double) offer comfort and tour-desk convenience. Premium: Phong Nha Paradise Cave Resort (~2.5 million VND) is the upscale trekking base. All are walkable from the town centre and within 5 km of cave entrances.

Practicalities

Entry fees: national park entry 40,000 VND, individual caves 150,000–250,000 VND. No formal opening hours; guides and operators run dawn–dusk.
Wet-season trips (Sept–Nov) mean slippery limestone, leeches and 12+ hour underground days — only for experienced cavers.
Sơn Đoòng requires medical clearance and fitness deposit ($500) at booking; bring insoles, electric torches and extra batteries.
Common foreigner mistake: underestimating the physical toll of jungle mud, river crossings and cave scrambling; train cardio and lower-body strength beforehand, and bring blister treatment.

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