Phong Nha: Vietnam's cave country, a full 2026 guide

Under the karst mountains of Quảng Bình province hide more than 470 caves. One of them — Son Doong — is the largest on the planet. Another — Paradise — stretches 31 km. A third — Dark Cave — lets you zipline over a river, paddle in by kayak and wallow in mud for 450,000 VND (~$18).

Phong Nha-Kẻ Bàng National Park has been a UNESCO World Heritage Site since 2003. In July 2025 UNESCO extended the boundary to take in Laos's Hin Nam No park — creating the first transboundary natural World Heritage Site shared by Vietnam and Laos. And in 2026 a survey team logged 25 new caves, including Cha Ngheo, which drops to a depth of 350 metres.

It sits 500 km south of Hanoi. The nearest airport is Dong Hoi. Give it three days minimum to see the highlights. The easiest way in is a domestic flight to Dong Hoi, then a taxi to the village of Son Trach.

Phong Nha-Ke Bang National Park — what it is

1,233 square kilometres of karst mountains blanketed in jungle. The geology is over 400 million years old, making this one of the oldest and largest karst regions in Asia.

The park sits in central Vietnam, historically in Quang Binh province (Quảng Bình). Since 12 June 2025 that province has been folded into the enlarged Quang Tri province (Quảng Trị) — you will still see the old name on signs and older maps. It is 500 km south of Hanoi, 210 km north of Hue and 300 km from Da Nang. The nearest city is Đồng Hới (Dong Hoi), about 45 km away.

In 2026 a Vietnamese–British survey team logged 25 new caves inside the park, more than 13.6 km in total, among them Cha Ngheo (Chà Nghèo), where cavers roped down to a depth of 350 metres. The park is nowhere near fully explored.

The village of Sơn Trạch is the launch pad for every route. Hotels, restaurants, motorbike rental and tour offices all sit here. Base yourself in the village rather than Dong Hoi: it is closer to the caves, has more atmosphere and costs less.

Phong Nha caves — from budget to expedition

• Phong Nha Cave (Động Phong Nha): River cave by boat, 150,000 VND (~$6)
• Paradise Cave (Động Thiên Đường): 31 km long, entry 270,000 VND (~$10) with buggy
• Dark Cave (Hang Tối): Zipline, kayak, mud bath, 450,000 VND (~$18)
• Son Doong (Hang Sơn Đoòng): World's largest cave — $3,000 for a 6-day Oxalis expedition
• Hang En (Hang En): World's third-largest cave — ~$360 for a 2-day trek
• Son Trach village (Sơn Trạch): Hotels, restaurants, bike rental, tour offices

Six caves are open to visitors. Three you can do on your own; three require an organised tour. Prices span from 150,000 VND (~$6) to $3,000 for the full expedition.

Phong Nha Cave — the classic boat ride

Động Phong Nha is the cave that gave the park its name. It runs 7.7 km, with about 1.5 km open to visitors. The only way in is by water: you climb into a motorboat, glide through a rock arch and drift off into the dark. Inside are stalactites, stalagmites and floodlit chambers.

Entry is 150,000 VND (~$6). The boat is 750,000 VND for the whole group (up to 12 people). Solo? You either wait for others to share or pay for the boat yourself. It usually works out to 200,000–250,000 VND (~$8–10) per person. Prices can change, so confirm them at the ticket office before you go.

You can pair it with Tiên Sơn (Tien Son) — a dry cave nearby; check at the ticket office whether it is sold separately or as a combo. Climb the stairs for handsome formations. Allow 1.5–2 hours. No guide needed, good for everyone, kids included.

Paradise Cave — 31 kilometres of underground world

Động Thiên Đường — Paradise Cave. Found in 2005, opened to visitors in 2010. It is 31 km long in full; the public stretch is 1 km on wooden boardwalks. For an extra fee you can go 7 km deeper with a guide. Tickets and routes are in our full Paradise Cave guide.

Entry is 270,000 VND (~$10), and the electric buggy from the car park to the entrance is included, then it is a 1.5 km walk up steps to the cave mouth.

The scale inside is staggering. The vault rises around 60 metres. Stalactites hundreds of thousands of years old. The lighting turns the chambers into something out of a sci-fi film set.

Dark Cave — adrenaline and mud

Hang Tối — Dark Cave. This is not a contemplative stroll but a full-on activity. The circuit: a 400 m zipline over the river → kayak to the mouth → swim into the dark → mud baths inside the cave.

Entry is 450,000 VND (~$18). Everything is included — zipline, kayak, mud and a shower. No hidden extras.

Dark Cave is the best adrenaline-to-price ratio around: zipline, kayak and a mud bath for about $18. The mud really is therapeutic — your skin feels like silk afterwards. — guest reviews of Dark Cave, Tripadvisor, 2025

Son Doong — the largest cave in the world

Hang Sơn Đoòng — Son Doong. 9 km long, ceilings up to 200 metres, with a jungle, clouds and a river inside. A local found it in 1990; a British–Vietnamese caving team surveyed it in 2009.

The expedition runs 6 days / 5 nights and costs $3,000 (80 million VND). There is one operator only — Oxalis Adventures, which holds the exclusive licence. Groups are up to 10, for ages 18–70. The 2027 season is fully booked and 2028 has only limited availability; check the Oxalis website for open dates. Details are in our guide to the Son Doong expedition.

What's included: jungle trekking, nights camping inside the cave, river crossings, all meals and porters for the gear. You need to be genuinely fit — there is a health screening.

Hang En — the world's third-largest cave

Hang En — the Swallow Cave. 1.6 km long, with a 120 m entrance portal. Inside there is a beach, a river and thousands of swifts. The tour is 2 days / 1 night, ~$360, run by Oxalis. Many people find it even more moving than Son Doong — and it is a fraction of the price.

Tu Lan — a cave system for the active

Tu Lan is a whole system of caves with underground rivers and waterfalls. A day tour with Oxalis is ~$75, a two-day expedition ~$253. It is less hyped than Son Doong, but for sheer experience it is one of the best trips in the park. How it stacks up against canyoning and other thrills is in our Vietnam adventure activities guide.

Which cave to choose

Getting to Phong Nha

The nearest airport is Đồng Hới (code VDH). From Dong Hoi to the village of Phong Nha (Sơn Trạch) it is 50 km, about 45 minutes.

From Hanoi

Flying is the sensible choice. VietJet and Vietnam Airlines fly to Dong Hoi (check their sites for the schedule); book 2–3 weeks out and fares start around $25 one way. The train is for romantics — take the overnight sleeper, board in Hanoi in the evening and wake up in Dong Hoi. The bus is the cheapest but the slowest.

From Hue and Da Nang

From Hue it is a 3–4 hour bus or train, 150,000–200,000 VND (~$6–8). From Da Nang it is a 6–7 hour bus, 200,000–300,000 VND (~$8–12). There are also flights from Ho Chi Minh City to Dong Hoi; check with the airlines for direct options and fares on your dates.

Dong Hoi → Phong Nha

• Taxi / Grab: 300,000–400,000 VND (~$12–16), 45 min
• Local bus: 100,000 VND (~$4), but infrequent
• Hotel transfer: many offer it free or cheap

Getting around Phong Nha

A motorbike is the main way to get around. Rental is 100,000–150,000 VND (~$4–6) a day. The roads are good and traffic is minimal. Bicycles go for 50,000–80,000 VND (~$2–3) a day and suit the closer caves. Grab works, but cars are thin on the ground.

Where to stay in Phong Nha

Son Trach (Sơn Trạch) is the village at the park entrance. It is 5–15 km from the caves. Quiet, green, with karst peaks in view. Restaurants, rental and tours all sit along one street.

Dong Hoi is the airport city, about 45 km from Son Trach. It has more hotels, a beach, cafés and ATMs. The downside: a 45-minute drive each way, every day. Our pick — stay in Son Trach.

Phong Nha Farmstay is a backpacker legend — pool, bar and a social buzz. It is where travellers meet and form groups for tours. Easy Tiger Hostel offers dorm beds; check prices for your dates.

Book ahead in high season (February–April). The rest of the year you can usually just turn up.

Areas, 2026 prices and specific places are in our guide to where to stay in Phong Nha.

Food & restaurants

Quang Binh cooking is simple, filling and heavy on river fish and seafood. A typical lunch is 40,000–80,000 VND (~$1.60–3.20). Dinner with a beer runs 100,000–150,000 VND (~$4–6).

What to try

Bánh bèo — small steamed rice cakes topped with dried shrimp, served ten to fifteen to a plate. A portion is 20,000–30,000 VND (~$0.80–1.20).

Cháo lươn — rice congee with eel. It sounds unusual and tastes soft and gentle. 25,000–35,000 VND (~$1–1.40).

River fish — grilled or steamed. In Son Trach restaurants you pick yours straight from the tank. 80,000–150,000 VND (~$3.20–6) a portion.

Restaurants in Son Trach

Bomb's Craters Bar & Restaurant — named after the bomb craters left by the Vietnam War. Vietnamese and Western food, good burgers, cold beer. Expect 80,000–120,000 VND (~$3.20–4.80) a head.

The Pub with Cold Beer — yes, that is the actual name. Local beer, simple food and a view over the rice fields. Bamboo Cafe does breakfasts, coffee and fresh juices.

VietnamSpot on InstagramTips, lifehacks and news for living in VietnamFollow@vietnamspot

Weather & when to go

Phong Nha is central Vietnam, with two clear seasons: dry (February–August) and wet (September–December).

Best time: February to April. Warm, dry, every cave and tour running. The land is green after the rains and the rivers are full — without the flooding.

June to August is fine if you can handle 35°C heat. The caves stay cool year-round (+18–20°C).

Trip budget

Three days is the standard length of a Phong Nha trip. Here is what it costs:

Budget means a hostel, a motorbike, the two self-guided caves and street food. Comfort is a farmstay, taxis, the same caves and restaurants. Luxury is a boutique hotel and pricier restaurants. Tours are not in the totals: Hang En costs ~$360, and Son Doong ($3,000) is a line item all of its own.

Itineraries: 2, 3 and 5 days

2 days — the minimum

Day 1: Land in Dong Hoi → transfer to Son Trach → Dark Cave (zipline, kayak, mud) → dinner at Bomb's Craters.

Day 2: Morning at Phong Nha Cave (boat) + Tien Son. Lunch. Paradise Cave. Evening flight out of Dong Hoi. Three caves in two days — tight, but doable.

3 days — the sweet spot

Day 1: Arrive → Son Trach → Dark Cave → an evening stroll around the village.

Day 2: Phong Nha Cave (boat) → lunch → Paradise Cave (standard route or the 7 km extended one).

Day 3: Cycle through the rice fields and villages → lunch → transfer → fly out. Or swap the ride for a Tu Lan day tour (~$75).

5 days — the full version

Days 1–3: As above. Days 4–5: A two-day Hang En trek ($360) — trekking, a night camping in the cave, sunrises over the jungle. Or Tu Lan for two days: cheaper, just as powerful.

What to pack and what to know about Son Trach

Bring sturdy shoes (not flip-flops — caves are slippery), a headlamp, swimwear and a towel for the Dark Cave, sunscreen and a waterproof phone case. A light jacket helps: it is +18°C inside the caves.

Mobile data works in the village and on the main roads; there is no signal inside the caves. Hotel Wi-Fi exists but is slow.

There are no serious safety concerns. Traffic is calm (this is not Ho Chi Minh City). Follow the instructions inside the caves. For the Dark Cave you must be able to swim.

The park is a UNESCO site with strict rules: carry your rubbish out, don't touch the stalactites, and expect fines for breaking either.

FAQ