Hang Én Cave

Hang Én is the third-largest cave in the world by volume, sitting upstream from Sơn Đoòng in the same river system inside Phong Nha–Kẻ Bàng National Park. For most fit travellers it is the best cave experience in Vietnam at a sensible price.

What it is

A river cave 1.6 km long with three entrances, a vast chamber 100 m tall, and a sandy beach inside where you camp. National Geographic put it on the cover of their March 2011 issue. The cave was used by Ban Doong villagers (an isolated ethnic minority hamlet) as a shelter for generations before the British mapping team formally surveyed it in 1995.

The trek

A 2D1N or 3D2N expedition with Oxalis Adventure, the licensed operator:

The 3-day variant adds a night in Ban Doong village with the Bru-Vân Kiều ethnic minority and a longer cave exploration.

What you see

• 10 km of valley jungle trek with multiple river crossings.
• Ban Doong — a 30-person village reachable only on foot.
• Vast cave entrance arch (around 100 m wide and 120 m tall).
• Internal sand bank where you sleep.
• A round skylight in the cave roof letting in cathedral-style light beams.
• Cave-river swimming inside the third chamber.

How to get there

Fly or train to Đồng Hới (DHO). Transfer 50 km to Phong Nha town where Oxalis is based and the trek begins. Vietnam Airlines, VietJet and Bamboo all serve Đồng Hới from Hanoi and HCMC.

When to go

January to August is the operating season. The cave river floods in monsoon (September–December). March to May is optimal — dry, warm, jungle still green. June–August is hot.

Cost and what's included

• 2D1N price: $370 per person (2026).
• 3D2N price: around $480 per person.
• Includes all meals from Day 1 lunch onwards, camping gear, sleeping bag, headlamp, helmet, park permit, porters, and one night's hotel in Phong Nha before the trip.
• Excludes flights and tips (~$30 per trekker).

Fitness requirements

You need to be able to walk 10 km on uneven ground with elevation changes, cross rivers up to thigh-deep, and use rope handholds on short steep sections. No technical climbing. Oxalis screens at booking but the bar is significantly lower than Sơn Đoòng.

Booking timeline

Hang Én sells out faster than people expect. Book 2–4 months ahead for the dry season; 1 month is workable in summer. Direct via oxalisadventure.com.

Practicalities

• Bring quick-dry trekking gear; your feet will be wet for the river crossings.
• The cave beach where you camp is sandy and comfortable.
• Tipping porters is expected — they carry your food, tents and personal bag.
• Photography is allowed.
• No mobile signal from the moment you leave the trailhead.

Honest take

If you cannot afford or fit Sơn Đoòng, Hang Én is the answer. The cave is genuinely vast, you sleep inside it, and the trek in is one of the prettiest jungle walks in central Vietnam. $370 sounds expensive for a Vietnam activity but it is excellent value compared to anything similar in the world. The 3-day version with Ban Doong is the choice if you want extra cultural depth. Combine with a day at Paradise Cave before or after.

Related: Sơn Đoòng expedition · Paradise & Phong Nha caves · Phong Nha–Kẻ Bàng NP · Phong Nha town

Why visit Hang Én Cave

Hang Én delivers one of Southeast Asia's most memorable cave experiences at a fraction of Sơn Đoòng's cost. You actually live inside the world's third-largest cave for a night, sleeping on a sandy beach illuminated by a natural skylight that throws cathedral-like light beams across the chamber at dawn. The 10 km trek in is a lush valley walk with multiple river crossings that immerses you in jungle few travellers ever see, ending at Ban Doong — a 30-person ethnic minority village reachable only on foot.

When to go

March to May is ideal: dry, warm, jungle lush and green, crowds manageable. June–August is hot and sweaty but workable. Avoid September–December entirely — the cave river floods and expeditions close. Book 2–4 months ahead for peak season; last-minute slots open in summer if you're flexible.

How to get there

Fly to Đồng Hới (DHO) from Hanoi or HCMC on Vietnam Airlines, VietJet, or Bamboo (2–3 hours, ~$40–80). From the airport, hire a taxi or join a shuttle to Phong Nha town (50 km, 90 minutes, ~$15–25). Oxalis Adventure runs all treks from their base in Phong Nha and handles logistics from there.

What to see and do

• Trek 10 km through primary jungle with guides identifying birds, butterflies, and rare plants en route
• Wade and swim across the river system — multiple crossings from knee- to thigh-deep
• Meet Ban Doong villagers and understand traditional Bru-Vân Kiều life before heading to the cave
• Sleep inside Hang Én on its sandy internal beach with the 120 m-tall entrance arch framing the night sky
• Explore the cave's three chambers, the internal river pools, and the natural skylights that flood the cave with light

Where to stay nearby

Budget: Phong Nha Town Backpackers ($10–15/night) or family homestays in Ban Doong included with the 3D2N trek. Mid-range: Phong Nha Riverside Resort ($60–80) with hot water and river views. Premium: Phong Nha Gorge Eco-Lodge (~$150–200), a hilltop property with infinity pools and chef-driven meals. Most trekkers overnight in Phong Nha the night before departure; Oxalis includes one night's hotel in the 2D1N cost.

Practicalities

• Entry & hours: Expeditions run Year-round (weather permitting). Cave permits included in Oxalis tour price.
• Fitness: Moderate to fit. You'll climb rope handholds on 2–3 steep jungle sections and river-cross repeatedly; no technical climbing required, but grip strength and stamina matter.
• Foreigner pitfall: Don't underestimate the wet. Bring proper trekking shoes with grip and a quick-dry bag for valuables — your feet will be soggy for 8+ hours. Cotton socks lead to blisters; pack synthetic or wool.