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An action-packed day to discover the wet and dry caves of the Tu Lan cave system, including swimming, climbing and picnic lunch by a waterfall. This tour is for travelers who are short on time or don’t want to sleep in the jungle – but still want to explore the caves.

  • Discover the Tu Lan caves in just one day!
  • Swim and wade through underground rivers.
  • Trek over jungle hills and mountains.
  • Picnic lunch next to a natural swimming pool and waterfall.
  • Marvel at beautiful and unusual cave formations.
Key Information
  • One day exploring
  • Not available in October due to annual floods. Available throughout the rest of the year.
  • Tours depart every day except Thursday.
  • Group size: 12 people maximum.
  • Age: 16 years and above. 15 year olds with experience will be considered.
  • Distance: 8km trekking, 500m caving, 150m swimming in the caves, 150m elevation gain, 10m ladder climb.
  • Difficulty: Level 2 • moderate.
  • Itinerary (below) is subject to change with the weather. Paths can be slippery and muddy after rain.


Due to the weather conditions the itinerary may need to be changed at short notice. The paths can be muddy and slippery after rain. Lifejackets must be worn when swimming in the caves.

Morning: Secret & Hung Ton Cave

07:30 - 08:00 AM Pick up and one-hour drive on Day 1 to the Oxalis Adventure office in Tan Hoa, located 70km from Phong Nha. Briefing and tour preparations are here.

The trek starts after the briefing with a flat path past peanut fields and grazing buffalo and cows. A river crossing leads to a short but steep and rocky uphill section. Here you will visit Secret Cave, a small but beautiful cave. Drop downhill into the next valley. Cross the valley on a flat path to reach the entrance of Hung Ton Cave. Pass through the dry passage to the 10m ladder, which you will climb down with an additional safety rope attached to you. At the bottom of the climb you will wear a lifejacket ready for the swim out of Ton Cave Exit.

Afternoon: To Mo Valley

The cave exits into a beautiful jungle valley where you will have lunch, and lots of time to swim. After lunch the trek passes over a short but steep hill to re-cross the flat valley. Up and over a short hill leads you back to the river crossing, then back over the buffalo fields to the office where a cold drink awaits. Transfer to Phong Nha arriving between 06:30 PM and 07:30 PM.

Adventure Level 2 · Moderate

  • 2-day tour
  • Easy to moderate trekking
  • 8km of trekking including up to 500m of caving
  • Total elevation gain: 150m
  • 150m swimming in the caves
  • River crossings
  • 10m ladder climb with safety rope

Frequently Asked Questions


Please visit our FAQ general page to read our specific What to Bring list before departing for Vietnam and your cave expedition.


  • Caving & safety gear: caving helmet, caving headlight, life jacket, gloves
  • Basic canvas trekking boots (only if you do not have your own pair) sizes 36 – 46
  • Meals: picnic lunch
  • Professional English-speaking tour guide and safety assistants
  • Porter to prepare meals and pump water
  • Shared dry box for phones and small cameras (limited availability for larger cameras)
  • Water filter and purifier (used only by guide and porters)
  • Eco-friendly compost toilet using western toilet seat at lunch site.
  • First Aid Kit and Medical Rescue Equipment (application by guides and porters only)
  • Secure Storage Facility at Oxalis Headquarters to store all luggage you will not be taking on the trek


  • 1 long (easy to dry) pants and 1 long sleeved shirt to wear during the trek (quick dry)
  • 1 pair of trekking boots/shoes – difficult terrain, good footwear necessary. Gore-Tex/waterproof boots are NOT recommended as they do not drain well (if you prefer your own comfortable pair)
  • 1 change of clothes for after the tour
  • 1 pair of calf length densely woven socks (not ankle socks!)
  • Personal items: mosquito repellent, sunglasses, hat, camera

Pricing and availability

Please choose your departure date using the calendar below to book your tour with us.

  • This tour is operated from mid-Nov to mid-Sep (closed from mid-Sep to mid-Nov).
  • The days in bold are still available
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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.

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