'Cave Gia Re' Search, Sources Of Vietnamese Tradition

Home to the world’s largest caves, central Vietnam’s Phong Nha is redefining adventure travel in Asia.


Oxalis Adventure is the leading adventure tour operator in Vietnam.

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We pioneered life-changing caving and jungle experiences in UNESCO-recognized Phong Nha-Ke Bang National Park and we are the gateway to Hang Son Doong, the largest cave on the planet. But Son Doong is only the beginning – 70% of the jungle remains unexplored.


We’ve discovered and we visit more caves than anyone else.

Some are big enough to fit skyscrapers, lending themselves to underground campsites unlike anywhere else in the world. Others house swimmable rivers that burrow beneath the ground. Every adventure is possible, from one-day adventures to four-day expeditions.


Community involvement and safety are paramount.

Oxalis Adventure is 100% locally owned and we provide employment for hundreds of tour guides and porters in one of Vietnam’s poorest provinces. But we work closely with caving experts from The British Vietnam Caving Expedition Team to ensure that we meet international standards of safety and safeguard the integrity of the caves.

Can I visit Vietnam now?

Yes, you can. The Government of Vietnam has just decided to re-open the country and normalize visa procedures as the sames as before 2020. Effective from March 15th, 2022. International travellers can enter Vietnam very easy. No test on arrival is required, no quarantine is needed, vaccination is not a must.

Big promotion for Xiều (returned customer)

Want to camp in the largest cave chambers on the planet? Or plunge into underground rivers? How about harnessing up and taking on subterranean rope-assisted climbs? All this is possible, and more! Take a look below and choose your adventure based on the number of days you have to explore.


Tu Lan Encounter

A very enjoyable 2-Day tour where you get to take a plunge into some of Vietnam’s top river caves, based inside the mesmerizing Tu Lan Cave System.

VND 5,500,000/pax


Wild Tu Lan Explorer

A great trekking and caving adventure including the wildest caves of the region like Rat Cave, Ken Cave, Kim Cave, Hung Ton Cave, Song Oxalis Cave and Tu Lan Cave!

VNĐ 9,500,000/pax



Tu Lan Experience

This is one of the most popular one day tours in the region, as your day is filled with adventure and the unique experience of swimming underground.

VND 1,800,000/pax



Hang Tien Endeavour

A moderate tour where you will trek, enjoy a natural pool and camp overnight, while exploring the largest dry cave of the Tu Lan Cave System – Hang Tien.

VND 6,500,000/pax


2 Day · Level 2 · Easy

Tu Lan Family Adventure

An ideal journey for all members of the family to explore Tu Lan"s wilderness. Many enjoyable mini-games and activities for kids to join in such as trekking, swimming, painting, caving, and overnight camping.

VND 6,500,000/pax
1 Day · Level 1 · Introductory

Tu Lan Family Experience

An ideal family trip to explore nature and the magnificent caves of the Tu Lan cave system including trekking, swimming in natural steam, picnic lunch at the river, discovering Rat Cave, exciting mini-game.

VND 2,300,000/pax

Son Doong Expedition

Son Doong Cave is the largest cave on Earth, with its own eco-system and is embellished with gigantic formations. The Son Doong Expedition is truly the adventure of a lifetime.


Hang Ba Deep Jungle Expedition

Those who join the Hang Ba Deep Jungle Expedition will receive a totally new experience from Oxalis Adventure. Renowned for sustainable tourism, Oxalis will now step up to actively promote conservation of biodiversity.

VND 50,000,000/pax

Tu Lan Expedition

Go into the depths of the majestic Tu Lan Cave System and with plenty of trekking, underground swimming and other thrilling activities, you will explore 10 incredible caves.

VNĐ 18,000,000/pax

Hang Tien Exploration

Enjoy extensive jungle trekking, camping under the stars and exploring gorgeous caves, especially the Hang Tien Cave, the biggest dry cave of the Tu Lan Cave System.

VNĐ 9,900,000/pax

Hang Va Expedition

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On this expedition, you will get to explore and enjoy adrenaline-pumping caving activities inside the incredibly beautiful Hang Va cave, known to have some of the rarest formations ever seen.

VNĐ 9,900,000/pax

Hang En Adventure

Hang En is one of the largest natural caves in the world. Camp in the enormous cave entrance and explore the length of the cave including the cinematic exit that has featured in Hollywood films.

VND 7,600,000/pax

Hang Tien Discovery

Spend a day filled with adventurous trekking through the wilderness of the Tu Lan Cave System and explore the huge Hang Tien cave, also known as the Fairy Cave.

VND 2,000,000/pax

Trekking and exploring nature in Tu Lan
Starry night at Hang Tien campsite
Swim underground at the Tu Lan Cave System
Camp inside the world"s third largest cave - Hang En
Explore the largest cave on Earth - Hang Son Doong
Inside one of the world"s rarest underground caves

Oxalis Adventure is the only adventure tour company to visit Son Doong, the largest cave on the planet. But there’s so much more to explore. We also hold exclusive rights to Hang En, the world’s third largest cave, and the enormous twin Hang Tien caves. Nuoc Nut and the Tu Lan cave system are underground adventure playgrounds with swimming and climbing. For phenomenal formations, venture to the more recently discovered Hang Va.

Son Doong Cave

Son Doong Cave is the largest cave in the world, with its own jungle, river and gigantic formations, it is truly a natural wonder unlike any other in the world!

Hang En Cave

Hang En Cave is the world’s 3rd largest cave located in Phong Nha Ke Bang National Park. Hang En is the best cave camping in the world

Tu Lan Cave System

Tu Lan Caves System is comprised of over 10 caves, in Tan Hoa village. The area has been used as film location for Kong: Skull Island movie.

Hang Tien Cave

Hang Tien is the largest dry cave of the Tu Lan Cave System, located about 70 km away from Phong Nha Ke Bang National Park.

Hang Va Cave

Hang Va Cave was found in 2012. This cave is located below Son Doong cave, and has rare formations called tower cone.

Nuoc Nut Cave

Nuoc Nut Cave has become one of the world’s most attractive natural wonders. This cave is suitable for family to do a bit of adventure

Nothing builds a team like exploring, swimming, climbing, cooking and sleeping in the wilderness. We are central Vietnam’s most established outdoor team building operator, with rewarding activities like scavenger hunts and obstacle course races. All our team building activities are tailor made for the size of the group and the objectives of the activity.

Safety is paramount. We employ cave safety experts from The British Vietnam Caving Expedition Team and use equipment from France, Switzerland and the UK to ensure that we meet international standards of safety. All our tour guides, safety assistants and porters go through a comprehensive training program.


As a top place to stay in Phong Nha, Chay Lap Farmstay embraces you with tranquillity surroundings of peaceful farming fields, private rooms, fully equipped accommodation, and authentic local experiences.

Oxalis Adventure employs over 500 local people from Phong Nha and Tan Hoa, many of whom had turned to illegal logging and hunting to make ends meet. We also collaborate with and employ cave experts from The British Vietnam Caving Expedition Team, ensuring safety and professionalism across our adventure tours.

Technical & Safety Director

Howard Limbert

Mr. Limbert is looking after technical safety and conservations at Oxalis. He is the team leader of The British Vietnam Caving Expedition. He and his team have explored more than 300 caves in Phong Nha in the past 30 years and one of them is Hang Son Doong, the World"s largest cave.

Experienced Guide

Hồ Trung Hiếu

Like his father, Hieu joined Oxalis and through years of perseverance as a Son Doong safety assistant, he became a great tour guide who continues to inspire the local youth.


Trà Trần

Since 3 years, Tra has been one of our customers" favorites due to her charming and friendly nature, along with her unconditional love for Phong Nha and its beauty.

Useful information

Booking Policies

Tour & expedition

Our Caves


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