VND 69,800,000/pax approx. US$3,000 Promo price VND 58,200,000 Normal price VND 69,800,000/pax (~$3000) See dates
The biggest cave on the planet when measured by cross-section. Discovered and explored for the first time in 2009. Only open to the public since 2013. Unique for the two enormous dolines (cave roof collapses) and underground rainforests. Home to the “Great Wall of Vietnam,” a 90m high calcite barrier. Various unusual cave formations, including huge cave pearls, towering stalagmites and phytokarst. Nestled in Phong Nha-Ke Bang National Park, home to some of the world’s largest caves. Oxalis Adventure works with the British Cave Research Association and the Vietnamese government to carry out the expeditions. For conservation and safety reasons, you can only visit Son Doong on four-day expeditions with Oxalis Adventure.
On December 10, 1990, during a routine trip into the jungle, Mr. Ho Khanh accidentally discovered the cave entrance which now became known as Hang Son Doong. On April 7, 2009, Mr. Peter MacNab, a member of the British Cave Research Association (BCRA) was the first to enter Son Doong Cave. On March 17, 2010, The British Cave Research Association (BCRA) team completed climbing the calcite wall called the "Great Wall of Vietnam" to exit the cave. On 14 April 2010, the BCRA expedition team, led by Mr. Howard Limbert, had completed the survey and measurement of the entire Hang Son Doong Cave. The expedition team then announced Hang Son Doong as the world"s biggest cave with a volume of 38.5 million m3. On April 30, 2013, the Guinness Book of World Records published the 2013 book of world records, which recognized Hang Son Doong as the largest cave in the world.

Local man Ho Khanh discovered Son Doong in 1990 while searching Phong Nha-Ke Bang National Park for food and timber to earn a modest income. During his search he stumbled across an opening in a limestone cliff, noticed clouds billowing out from the entrance and heard the sounds of a river raging from somewhere inside. He returned home and forgot about the cave.

Ho Khanh met Howard and Deb Limbert of the British Cave Research Association (BRCA), who were conducting exploratory caving expeditions in the area. After hearing his stories, they urged Ho Khanh to rediscover the cave, which he eventually did in 2008, after several attempts. In 2009, he led Howard, Deb and a team of other caving professionals to the opening. After the first survey in 2009, the team were able to conclude that the cave had the largest cross-section of any cave anywhere on the planet.

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The cave was named “Son Doong” and Ho Khanh is still an integral part of every Son Doong Expedition

Son Doong is relatively young – about 3 million years old in a limestone area dating back 400 million years. The mighty Rao Thuong River carved out Son Doong as it eroded away the limestone, forming an enormous tunnel beneath the Truong Son Mountains. The large dolines (or skylights) collapsed sometime in the last 500,000 years, creating massive openings to the outside world. Cave pearls the size of baseballs and stalagmites the size of tall buildings have formed from water dripping from the cave ceiling.

The first expedition was halted by a 90m high calcite barrier, which was jokingly dubbed the “Great Wall Of Vietnam.” It wasn’t until the second expedition in 2010, when the Great Wall was finally climbed and the end of the cave was found. The main huge passage is over 5km long with sections reaching up to 200m tall and 150m wide. Son Doong is large enough to house an entire 40-story New York City block skyscraper.

Cave experts are researching the connection between Son Doong Cave and neighbouring Thung Cave. If the connection is made , Son Doong will be the largest cave in the world by volume, as well as cross-section. Find more information about the diving expedition in Son Doong Cave.

Hang Son Doong was surveyed by a team of the British Cave Reserach Associasion (BCRA) led by Mr. Howard Limbert in 2009. The Expedition team then announced as the world"s largest natural cave with a volume of 38.5 million m3. The measurements were accepted by a number of senior karst geologists included Dr. Tony Waltham. The measurements were then accepted by a number of world"s senior karst geologists included Dr. Tony Waltham. Hang Son Doong was later published by National Geographic Magazine and National Geographic TV.

On April 30, 2013, the Guinness Book of World Records announced the 2013 book of world records, in which workers Hang Son Doong is the largest cave in the world. Link on Guinness website https://www.guinnessworldrecords.com/world-records/66739-largest-cave.

You can only visit Son Doong on four-day expeditions with Oxalis Adventure.

Son Doong Expedition 4 Days

Chày Lập Farmstay

A residence located in the middle of a vast green forest. You’ll enjoy peace, tranquility while having all your needs anticipated and met with ease at Farmstay. An ideal departure point to begin your discovery of magnificent caves.

Sơn Đoòng Bungalow

Occupying a beautiful location in the center of Phong Nha Town, Sơn Đoòng Bungalow is a resort paradise for people of all ages. Modernly designed, fully equipped, and elegantly blending into nature.

Oxalis Home

Ideally located along the peaceful Son River, Oxalis Home Hotel boasts some of the best views in Phong Nha. Your stay will be filled with lots of free services activities.


Victory Road Villas

Victory Road Villas is a residence that fuses contemporary western elegance with local traditional both North and South Vietnamese.

Hồ Khanh Homestay

Homestay of the man who discovered Son Doong - the largest cave in the world. Rooms in a traditional wooden house with stunning views of Son river, bar, shared lounge, garden, terrace,...

Areca Bungalow

Nestled on the gentle Son River, Areca Bungalow has a recognizable style. In front of each room, there is a small garden and an open space in the yard.

Whether you prefer long treks, camping in a cave, sleeping under the stars in the jungle, swimming underground in river caves, explore the huge dry caves or just taking an exploratory day trip, Oxalis Adventure Tours can provide the right amount of adventure just for you.

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 1,800,000/person Promo price VND 1,620,000 Normal price VND 1,800,000/pax
1 Day · Level 3 · Moderate

Hang Tien Discovery

With only one day, you can still enjoy a challenging trek, a natural swimming pool and see a spectacular cave.Hang Tien, also known as Fairy Cave has an enormous entrance, large calcite formations and unusual rock features.

VND 2,000,000/person Promo price VND 1,800,000 Normal price VND 2,000,000/pax
1 Day · Level 2 · Easy

Tu Lan Experience

An action-packed day trek to explore the marvelous jungle and caves of the Tu Lan System - home of the Hollywood blockbuster Kong: Skull Island (2017) by Jordan Vogt-Roberts.

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VND 1,800,000/person Promo price VND 1,620,000 Normal price VND 1,800,000/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 5,500,000/person Promo price VND 4,950,000 Normal price VND 5,500,000/pax
2 Day · Level 3 · Moderate

Hang Tien Endeavor

This is a challenging trek to visit Hang Tien 1 & 2 - two biggest caves of Tu Lan cave system. Hang Tien means Fairy Cave in Vietnamese as it looks otherworldly with an enormous entrance, calcite formations and rock features.

VND 6,500,000/person Promo price VND 5,850,000 Normal price VND 6,500,000/pax
2 Day · Level 2 · Easy

Tu Lan Cave Encounter

This tour offers a glimpse into the amazing beauty of the Tu Lan area: caves, karst mountains, jungle, and waterfalls. It is an opportunity to go deep into the rugged and untouched nature of Vietnam.

VND 5,500,000/person Promo price VND 4,950,000 Normal price VND 5,500,000/pax
2 Day · Level 3 · Moderate

Hang En Cave Adventure

An unforgettable adventure into one of the largest caves on Earth – Hang En, where you get a bucket list camping experience inside the cave and admire nature’s beauty like never before.

VND 7,600,000/person Promo price VND 6,840,000 Normal price VND 7,600,000/pax
2 Day · Level 4 · Challenging

Hang Va Expedition

A true underground adventure to visit two spectacular river caves of the National Park. Nuoc Nut Cave is a large cave with both dry and river passages with clear blue pools.

Promo price VND 8,000,000 More benefits included
3 Day · Level 4 · Challenging

Hang Tien Exploration

The perfect journey to explore both most fascinating wet and dry caves, especially Hang Tien 1 and 2. They are the biggest dry caves of the system with enormous entrances, large calcite formations and unusual rock features.

VND 8,500,000/person Promo price VND 7,650,000 Normal price VND 8,500,000/pax
3 Day · Level 3 · Moderate

Wild Tu Lan Cave Explorer

This exciting journey has some challenging sections, but with the help of the team you will explore six amazing caves. River caves where you can swim or raft and dry caves covered in outstanding calcite formations.

VND 8,000,000/person Promo price VND 7,200,000 Normal price VND 8,000,000/pax
3 Day · Level 2 · Easy

Quang Binh Exploration

The 3-day-2-night package is designed exclusively for those who are looking for a vacation combined with exploring the uniqueness of cave systems in Quang Binh.

5,600,000 đ/pax
4 Day · Level 6 · Hard

Son Doong Cave Expedition

This four day expedition will explore Son Doong Cave the world’s largest cave passage. Trek through vast underground spaces and marvel at the continually changing display of stalactites and stalagmites.

VND 69,800,000/pax
4 Day · Level 6 · Hard

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
4 Day · Level 5 · Demanding

Tu Lan Expedition

This level 5 expedition is one of our most challenging treks. Throughout the four days you will explore numerous caves, both river caves and dry caves; abseil inside Tu Lan Cave down to the underground river

Promo price VND 15,000,000 More benefits included
4 Day · Level 2 · EASY

Quang Binh Experience

This package is designed for those who want to balance between discovery and relaxation with light activities, suitable for families traveling with their children.

6,300,000 đ/pax

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