Hang En Cave, Quảng Bình

Overview

Best months: Dec - Feb (sunbeam season - light shafts into the cave, mild trekking temperature). Jun - Aug (dry, warm, best swimming). Mar - May (spring, butterfly season, green forest).
Entry fee: 8,800,000 VND (~333 USD)/person. All-inclusive: guide, porters, meals, camping gear, caving equipment, travel insurance, national park fees.
Opening hours: Tour-based only; no independent access. Closed Oct - Nov for flood season.
Address: Tân Trạch, Bố Trạch, Quảng Bình

Things to Know

Crowds: Group sizes strictly limited by national park permit. Book 1-2 months ahead minimum, more for Feb-Apr peak. No independent access - only Oxalis authorized.
Difficulty: Level 3 - Moderate (Oxalis scale). 25km trekking + 3km caving, 650m elevation gain, multiple river crossings. Requires prior trekking experience. Must be able to run 5km in under 50 minutes. Age 16-70 only.
Safety: Leeches on trail - long socks and insect repellent essential. Swifts drop above camp - earplugs recommended. Cave closed Oct-Nov due to underground flood risk. River crossings range knee to chest depth depending on season.
Accessibility: Oxalis only (oxalis.com.vn). 8,800,000 VND (~333 USD) all-inclusive. Max 16 guests/group. 3-4 departures/week; daily mid-Dec to late Jan. Contact: contact@oxalisadventure.com / +84-919900357.
Seasonal: Dec-Feb: sunbeam season + mild trekking temperature - best for photography. Mar-May: spring, green forest, butterfly season. Jun-Aug: dry, warm, best swimming. Sep: last month before closure. Oct-Nov: closed - flood risk.

Gallery

About This Place

What Makes Hang En Cave Special

Hang En - 'Swallow Cave' in Vietnamese - is the third largest natural cave in the world and sits 3km from Sơn Đoòng, connected to it by an underground river system. Discovered by British explorer Howard Limbert in 1994, the cave is 1.6km long with three entrances, a ceiling reaching 145 metres at its highest and passages up to 200 metres wide.

Why Choose Hang En

What makes Hang En the right choice for most travellers is its positioning: challenging enough to feel like a genuine expedition, accessible enough for people with moderate fitness, and priced at a fraction of Sơn Đoòng.

Bản Đoòng and the Cave Campsite

The route passes through Bản Đoòng - a remote village of the Bru-Vân Kiều ethnic minority living inside the national park - before the cave mouth opens in the limestone cliff face. Inside, the campsite on the white sandbar is surrounded by the cave walls, the natural swimming pool, and the constant movement of swifts overhead.

How to Get There

How to Get to Hang En Cave

Oxalis Adventure Only

Hang En is in Tân Trạch commune, Bố Trạch district, about 65km west of Đồng Hới city. All access is through Oxalis Adventure (oxalisadventure.com/tour/hang-en-adventure-cave-camp), which operates from Sơn Trạch village near Phong Nha town. Transport from Phong Nha accommodation is arranged by Oxalis. The trek starts at the national park edge and covers approximately 11km each way, including the steep Dốc Ba Giàng climb and multiple river crossings, with a lunch stop at Bản Đoòng.

Getting to Phong Nha

From Đồng Hới to Phong Nha: 45 minutes by motorbike or taxi. Đồng Hới has domestic flights and a train station.

What to Expect

What to Expect at Hang En Cave

Day 1

Day 1: trek 11km through jungle canopy, 12+ river crossings, lunch in Bản Đoòng with the Bru-Vân Kiều community, arrival at the cave. The cave mouth alone is 110 metres high. Inside: white sandbar campsite, natural swimming pool (cold, fed from underground), a warmer river stream from outside, and tens of thousands of swifts in the ceiling. Evening: swifts return in columns at dusk.

Day 2

Day 2: morning exploration deeper into the cave including a swim across the underground river to reach sections with the densest formations, then the return 11km trek.

Seasonal Highlights

Seasonal highlights: Dec-Feb for sunbeams; Jun-Aug for swimming; Mar-May for spring forest and butterflies.

Travel Tips

Travel Tips for Hang En Cave

Hang En is the right choice for travellers who want a genuine cave expedition without the extreme cost or preparation of Sơn Đoòng. The tour is all-inclusive - guides, porters (1 guide + 8 porters per group of 10-16), meals, camping equipment, and caving gear. Physical preparation matters more than experience: walk 5km daily for 2 weeks before the trip.

The Hardest Section and Booking

The Dốc Ba Giàng climb on day 1 is the hardest section. Book early - groups are small and dates fill. Avoid October and November entirely.

Seasons and Comfort

Each season offers something different: the sunbeam window (Dec-Mar) for photography, summer (Jun-Aug) for swimming, spring (Mar-May) for the living forest. Winter nights inside the cave are cool - sleeping bags provided. If Sơn Đoòng is too expensive or too far out of reach, two days and one night inside the world's third largest cave is a more than reasonable way to touch something genuinely extraordinary.

Insider Tips

Based on real traveler experiences and commonly mentioned advice from multiple visitors.

Book via oxalis.com.vn - 1-2 months ahead minimum
Train beforehand: walk 5km daily for 2 weeks
Dec-Feb for sunbeams; Jun-Aug for swimming; Mar-May for spring forest
Bring earplugs - swifts are loudest at dawn
Pack light - shoes will be wet throughout; bring waterproof bag for phone
Hang En is only accessible via Oxalis Adventure - the sole authorized operator. Book through oxalis.com.vn/tour/hang-en-adventure-cave-camp. Group sizes are strictly limited - book at least 1-2 months ahead, more for peak months Feb-Apr.
The 'Son Doong alternative' framing is accurate: Hang En shares the same cave system (3km apart, connected underground), costs a fraction of the price, and is achievable with moderate fitness. If Son Doong is out of reach, this is the next best thing.
Train before you go. The full route is 25km (trekking) + 3km caving, with 650m elevation gain and steep ascents. Oxalis rates this Level 3 - Moderate. Requirements: prior trekking experience (at least one overnight trek or 2-3 day treks of 8km+/day with 300m elevation gain), and able to run 5km in under 50 minutes or climb 5 floors without getting out of breath. Walk 5km daily for at least 2 weeks before departure.
Age 16-70 only. Oxalis can suspend and escort guests out if they encounter significant difficulties - no refund applies in this case.
Pack light - porters carry camp equipment and food, but your own pack should be minimal. Bring: long-sleeve shirt and long pants (light, quick-dry), 2-3 pairs of long socks (insect protection), spare clothes for sleeping, swimwear, flip-flops for the campsite, sunscreen, insect repellent, headlamp, waterproof bag for phone/camera, charged power bank.
Your shoes will be wet for most of the journey - constant river crossings. Oxalis provides trekking shoes or bring your own quick-drain hiking shoes. Do not bring leather or non-draining footwear.
Dec - Feb: best for sunbeams. From December to mid-March, giant shafts of light pour through the cave mouth in the morning and reach deep into the cave, illuminating the sandbar campsite. Photographers prioritize this window.
Jun - Aug: best for swimming. The natural pool at the campsite is cool and clear - fed by underground water. Summer is dry, forest is golden-brown, creek water warm enough for comfortable swimming.
Mar - May: spring trekking. Forest is vivid green, butterfly season on the trail (thousands visible), mild temperature. Sunbeam season ends by mid-March.
Oct - Nov: closed. Oxalis suspends all Hang En tours due to flood risk from the underground river system. If visiting Quảng Bình in these months, consider dry cave alternatives: Tú Làn or Hang Tiên.
The campsite is 700m from the cave entrance, with a ceiling 140m high and 200m wide. Natural turquoise swimming pool fed by underground water in front of the tents. On clear days Dec-Feb, sunbeams shine directly to the campsite. On clear nights, stars and even moonbeams are visible from inside the cave. Monkeys and langurs occasionally visible on the cave entrance vines.
Group size capped at 16 guests. 3-4 departures per week (daily from mid-December to late January). Book via oxalis.com.vn. Cancellation: full refund if cancelled 7+ days before departure; no refund within 7 days.

FAQ

Common questions from travelers who've visited this place.

Why is Hang En considered the world's third largest cave?

Cave size is measured by cross-sectional volume - the width and height of the passages. Hang En ranks third globally behind Sơn Đoòng (also in Quảng Bình) and Deer Cave in Malaysia. Its passages reach up to 200m wide and 145m high, giving it a volume few caves on earth can match.

Is Hang En the right alternative to Sơn Đoòng?

Yes - for most travellers it is. Hang En is part of the same underground cave system (3km from Sơn Đoòng, connected via river), requires a genuine 2-day jungle trek, and delivers the experience of camping inside one of the world's largest caves. Sơn Đoòng costs several thousand dollars and books years ahead; Hang En is around 333 USD and bookable 1-2 months ahead. If Sơn Đoòng is the dream but out of reach, Hang En is the right answer.

What is the sunbeam phenomenon?

From December to mid-March, the angle of the sun causes giant shafts of light to pour through the cave's enormous mouth each morning, illuminating deep into the cave interior and reaching the sandbar campsite. The combination of the light beams, the swifts in the air, and the scale of the cave is one of the most photographed natural phenomena in Vietnam. Set an alarm - the light is best in the early morning.

How fit do I need to be?

Moderate fitness is required. The full route is nearly 22km round trip with a steep initial climb (Dốc Ba Giàng), 12+ river crossings, and humid jungle hiking. Oxalis recommends walking 5km daily for at least 2 weeks before the tour. The trek is not technical caving, but the distance and conditions demand genuine stamina. Oxalis porters carry all camp equipment and food.

What does the tour include?

Everything: professional guides (English-speaking), porters (8 per group of 10-16), all meals, camping equipment, sleeping bags, caving headlamps and gear, and transport from Phong Nha. You bring personal clothing, camera, and toiletries. The tour departs from and returns to Phong Nha/Sơn Trạch.

When is Hang En closed?

October and November - Oxalis suspends all tours due to flood risk from the underground river system that runs through the cave. The cave interior can flood rapidly during typhoon season. Alternative dry caves (Tú Làn, Hang Tiên) remain accessible during this period.

Nearby Locations

Paradise Cave9.2 km18 min by motorbike Mooc Spring10.1 km20 min by motorbike Dark Cave12.0 km24 min by motorbike Eight Ladies Cave13.6 km27 min by motorbike Phong Nha Cave15.2 km30 min by motorbike Phong Nha Botanic Garden16.8 km34 min by motorbike

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