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We have created links for all of our vital documents and ask that you read through each of these thoroughly prior to the start of the booking process. Our team has spent a lot of time creating these documents for you to have the best information in advance of the tour so most questions you could have will be answered by our documents.

Booking Process

Your participation in the expedition will be secured after you go through the five steps below. For detailed information about each step, please see this document: Download link

  • Step 1: Online Booking
    Choose a date for the Son Doong Cave Expedition and fill in your booking form completely. Please be detailed and honest in your medical & fitness history.
  • Step 2: Automatic Notification Email
    You will receive an automatic notification email that we have received your booking. If you receive this email, your spots are being held while we review your application.
  • Step 3: Booking Review
    Our technical advisory team will thoroughly review your application and contact you if we need further information. This may take up to 5 business days so we appreciate your patience.
  • Step 4: Approval Email & Payment Processing
    At this step, payment will be required via a credit card payment link we will send you. (Bank transfers are accepted for Vietnamese residents).
  • Step 5: Booking Finalization
    We will confirm your payment is received and your tour is confirmed.
  • Step 6: Pre-Departure Support & Follow Up
    If you need any information or support leading up to your tour, including planning your arrival and departure or booking extra nights here, we will be available to assist you.



  • Reservations will be accepted on a first come, first served basis through our online booking system.
  • Tour bookings are not for resale, and reservations cannot be transferred to another person.
  • Reservations for join-in tours will not be accepted via email or phone under any circumstance.
  • If you are interested in a private tour, please note that these have a different price, and that you will need to contact us directly to sign up.
Terms And Conditions

Please download the full document about terms and conditions here: Download link



Please download the full document here:

Son Doong Expedition 4D3N Download link


Medical Form

Medical form can be downloaded from here: Download link


This is a copy of our medical form for your reference onlythe idea is for you to know which questions we’ll be asking in our online form in case you plan in booking in pairs or groups. That way if you cannot have everyone with you as you go to make the online reservation, you’ll know their answers to the questions. Please do not email us this form back!


Please note that medical form has to be answered by each participant in a group booking.

For your own health, safety and enjoyment, it is important that you are of a suitable physical condition to participate in the tour activities. The questionnaire is to help us ensure you have a safe and enjoyable trek. Most medical conditions will not exclude you, so please be completely upfront about whatever condition(s) you have so that we can be best prepared to accommodate you. You will be days away from any hospital and we need to know your accurate situation. Please, do not lie on your medical form. We will do everything we can to help you join the tour. If your health status changes between when your booking is approved and when you join us here, it is your responsibility to advise us of that so that we can review your booking if necessary. If we find at any time that you have not completed the form honestly and in good integrity, we have the right to cancel your tour without refund.

Be advised that this tour is not for those with limited outdoor/trekking experience, those in poor medical condition, nor is it for children or expectant mothers. If you answer yes to any question, our specialist team will e-mail you for more details. This is routine, and you should not worry that it means you will not get on the tour.

Finally, be detailed in your answers, otherwise your reservation will be rejected – “regular walking”, “going to the gym” are not considered detailed. You must have some previous outdoor experience such as trekking/hiking, or climbing (not just indoor wall), caving, etc.


Physical Checklist

Prepare yourself for the best physical condition for the trip: Download link

Tour Dates

Please check the Son Doong Expedition 2019 available departures here . Please keep following this page and our Facebook fanpage to get newly updated notifications!


Frequently Asked Questions

Please visit this link: FAQ – Son Doong

If you still have any questions that have not been mentioned in the links and documents above, please let us know and we will do our best to get back to you in a timely manner.


Oxalis Adventure Tours


If you are seeking a taste of the caves and really don’t have enough time then we recommend a one-day cave and jungle trek. We currently have three tour options for you to select, each with a slightly different style and suitability.

• Phong Nha National Park 1-DayOur family adventure in the Phong Nha offers a great taste of untouched jungle and impressive wild caves. It is the easiest level of adventure but there is still 5km of trekking and 2km of caving, and optional swimming during warmer weather into one cave. It’s suitable for kids from 12 and above with good fitness, and so this makes for a great day for everyone! It costs VND 1,650,000 per person (USD 72).

• Tu Lan Experience – 1 DayThis is one of our original one-day tours and still one of the best adventures in Vietnam. This one-day tour includes rock scrambling, 50m swimming through a wild river-cave, and up to 9 km of trekking through the lush jungles. You will also strap yourself in for a 15m descent down a ladder. It costs VND 1,800,000 (USD 78) per person.

• Hang Tien Discovery – 1 DayThis one-day tour is perfect for trekking enthusiasts eager to see the largest cave of Tu Lan but without time for the two-day experience. Hang Tien is a dry cave so no swimming required, but still includes up to 4km of trekking through mostly flat jungle and about 500m exploring this incredible cave that will no doubt impress with its grandeur. It costs VND 2,000,000 per person (USD 87).



Our most popular cave adventures start from two-days providing an immersive jungle and caving adventure, each targeting a slightly different kind of adventure-seeker, or perfect for those who want to combine a couple of tours to see different caves and areas on one trip to Phong Nha.

• Tu Lan Cave Encounter – 2 DaysOur most popular tour exploring the famous jungle area of Tu Lan. On this overnight camping excursion, you will trek through a number of different dry caves, swim up to 500m through a couple of river caves, witness outstanding cascading waterfalls underground as featured in National Geographic, and spend the night at our jungle camp beside a gorgeous waterfall. It includes 12km of trekking and 3km of caving in total and is for those with a good adventurous spirit. It costs VND 5,500,000 per person (USD 239).

• Hang En Cave Adventure – 2 DaysFor two days, this is our best-value-for-money tour that includes one of the most jaw-dropping natural landscapes you will see in this lifetime. This cave is considered the second largest cave in Vietnam and third largest in the World, and it also makes up one night of the original five-day Son Doong Cave Expedition being so close to the largest cave in the world. It includes visiting Ban Doong Ethnic Village, located in the jungle, and a magnificent campsite on a sandy beach inside the cave. It includes 22km of jungle trekking at times quite rocky, multiple knee-deep river crossings, and elevation change of 400m (the ‘hill’ you won’t forget), and 4km of caving. This is a level 3 adventure on a scale of 1 to 6. It costs VND 7,600,000 per person (USD 330).

• Hang Tien Endeavor – 2 DaysA two-day trek into the jungle to see the largest dry cave of the Tu Lan area, exploring 5.5km of this truly stunning cave, with a variety of karst formations. This 13km trek is suitable for those not too keen on cave swimming or too many hills, but still up for an adventure. This is a level 4 adventure between 1 and 6, with 6 being the most challenging. It costs VND 6,500,000 per person (USD 283).

• Hang Va Expedition – 2 DaysA technically challenging, but equally rewarding two-day caving adventure in the heart of Phong Nha National Park. This tour takes you deep into the jungle to one of the most spectacular river-caves, with formations not seen anywhere else in the world! It involves rock scrambling, wading through an underground river, bouldering and rope-traversing within the cave, to reach the rarest tower cone formations. This involves quite a lot of technical work due to safety, but is not overly difficult, it includes 10km of trekking and 3 km of caving.  This is a level 4 adventure, with 6 being the highest. It costs VND 8,000,000 per person (USD 348).



Now, if you really want to increase the adventure and soak up the wild jungle of Vietnam, with plenty of time to relax and enjoy the area, we highly recommend a three-day caving tour of our Tu Lan or Hang Tien.

• Wild Tu Lan Cave Explorer – 3 DaysThis tour incorporates the very best of Tu Lan with two different jungle campsites besides stunning waterfalls, 3km of cave exploring through a number of caves, 1km of cave swimming and visiting some additional areas not included on our shorter experiences. Our three-day tour is very popular and tends to be booked out so get in quick to enjoy this thrilling jungle adventure. It includes 17 km of jungle trekking and with quite a bit of swimming you will need to have a good level of fitness. It is not for the faint-hearted, but still only considered level 3 adventure level compared to level 4 of the Hang Tien 3-day tour. It costs VND 8,000,000 per person (USD 348).

• Hang Tien Exploration – 3 DaysThis three-day tour stands out for combining a taste of Tu Lan with some river cave swimming, before crossing a mountain range to reach the valley for Hang Tien – the most astounding dry caves in the region, where you will enjoy trekking, bouldering over various rocky terrains to witnessing breathtaking patterned calcite walls & ceilings of Hang Tien. It’s challenging and definitely more suited to adventure enthusiasts who have trekking experience and prefer more challenging routes. It includes a total of 22km of trekking, 6.5 km of caving and an elevation change of 150m over one particular hillside. You will get wet, you will be challenged, but you will not be disappointed. Hang Tien is located adjacent to the Tu Lan area so you will enjoy the best of both worlds – a level 4 adventure out of 6 adventure levels. It costs VND 8,500,000 per person (USD 370).



For those looking for the ultimate adventure experience in Vietnam, and thriving for the real grand expedition of the world, you should opt for these 4-day journeys to explore the entire cave system of Tu Lan and the largest cave on Earth

• Tu Lan Expedition – 4 DaysYou will also explore all of the extraordinary caves in Tu Lan, including Kim Cave and Secret Cave that boasts phenomenal natural falls and karst formations inside these two unbelievable river caves. Complete a trek through Hang Tien Cave – famed for its vastness and magnificent formations. Our secluded jungle campsites are spectacular and mostly different from those visited on our shorter treks in the same region. This is a perfect alternative expedition for those who are unable to do Son Doong Expedition, still it’s challenging and not recommended for those without experience. It includes an additional night at Chay Lap Farmstay before the tour to ensure you are well rested and ready to depart early the following day. Level 5 on our 6 adventure levels. It includes 30km of jungle trekking, 5 km of caving, about 800m swimming through caves and one abseil in a cave in the pitch black – highly adventurous! It costs VND 15,000,000 per person (USD 652).

• Son Doong Expedition – 4 DaysBy now you would have seen some pictures of Son Doong Cave, and even they don’t do it justice. The record-breaking Son Doong Cave is hands-down one of the most stunning places on this planet Earth. The expedition is tough, but not too difficult so long as you have a strong resolve to achieve. It is surely one of the newest wonders of the world. Son Doong is not just another cave tour – it is life-changing to say the least. It includes 25km of trekking, 9 km caving including rope climbs, and the 90m ascent of the Great Wall of Vietnam using a ladder, elevation change of 400m and many river crossings inside and outside the cave. Level 6 on our adventure levels. It costs VND 69,800,000 per person (USD 3000).

STILL HAVE QUESTIONS?  Visit our FAQs section where we have a lot of answers for your questions and concerns.

WANT TO SEE VIDEOS OF OUR TOURS? Visit our youtube channel at

WANT TO CHAT LIVE WITH OUR ADVENTURE CONSULTANT? Please look at the green icon at the right corner on your screen below to talk to our Adventure Consultant.