Swimming is not necessary for Nuoc Nut 1-Day Discovery. You will traverse 2km in a river cave with the water level about knee-deep to belly-deep and the water temperature about 17 degrees Celsius.

Yes, for your own safety. You may encounter sharp rocks, thorny bushes, stinging plants, mosquitoes and more in the jungle, so long pants and long sleeves provide added protection.

Yes. We provide jungle trekking boots sized from 36 to 46 (European sizing) which are available for anyone to borrow on the morning of the tour. Please remember that you need a pair of long and high-quality socks to avoid getting blisters when wearing our shoes for the first time.

Please check the Arrival & Departure Guide on our website for more information.

All electronic devices will be collected and stored in a dry-box (25cm high, 15cm diameter) by our tour guide before you start swimming. Please bring your own dry-box or dry-bag if you have really big devices. Please note that you will have to carry your own camera if you have a professional and large camera and the same for its tripod.

We will pass the peanut fields however they are far away on both sides and we will not stop anywhere near them. It's unlikely that you will touch any peanuts. Just please let us know if you have any allergies in the Booking Form so that our chef is aware of your dietary requirements.

For the 15-meter ladder climb you will be wearing a safety belt and be supervised by our tour guide and guide assistant. The key is to keep looking straight or up, not down. This is not an extreme height by any means and we think it's a good chance to push your boundaries a bit, knowing that you will always be safe with Oxalis Adventure.

Please check the Arrival & Departure Guide on our website for more information.

All our tours start and end in the small town of Phong Nha, located about 50 minutes from Dong Hoi, which has the nearest train station and airport. If you are staying in Dong Hoi, we can pick you up for an added cost of 640,000 VND one way for a 4-7 seat car. Please advise your sales consultant if you would like this service.

As Hang Tien is a very big cave, there are only one or two narrow places (0.8 - 1 meter in width and a few meters in length), where you will walk with care, you don’t need to crawl.

In our experience, due to the diverse terrain we don’t recommend you wear sandals on our tours. We suggest you wear trekking boots or shoes which cover all of your feet and have good grip to do the tours, as the terrain is rocky, slippery and sometimes muddy.

The tour finishes in Phong Nha between 18:30 – 19:30 depending on the weather conditions and the group’s speed.
Then you can choose to leave for Hue/Da Nang/Hoi An by sleeper bus departing from Phong Nha between 19:45 – 20:00. If your next destination is in the north of Viet Nam, a sleeper bus departs from Phong Nha at 21:00. For more detailed information, kindly visit the guidance at Arrival and Departure.
If you would like to take the train from Dong Hoi, it’s best if your train departs after 20:30, your flight takes off after 21:30 and you have a private transfer arranged in advance with Oxalis Adventure (VND 640,000/4-7 seat car – 50 minutes driving).

You are welcome to leave behind extra luggage at our office. Anything you choose to leave behind will get tagged and placed securely in our locked storage room. More valuable things like ID or wallet we will keep it in a separate room for more secure.

While climbing skills are a great asset, you don’t need any technical climbing experience to join the Tu Lan Cave Encounter.

No, you cannot change your clothes during the tour. There is a lot of swimming combined with trekking and we don’t have time to change into dry clothes during the trek. When you reach the campsite, you can change and enjoy some warm drinks.

If you enjoy swimming and warm weather, we suggest you book the tour from April to August. If you are looking for a warm campfire at night, and cooler weather, you can book the tour between November and March. For safety reasons, there is less swimming in the caves if the air temperature is below 18 degrees Celsius. We will reduce the swimming part and do trekking combined with exploring the river caves by boat instead.

This is one of our best tours for photography enthusiasts. We recommend bringing a tripod and a wide-angle lens if you have it to best capture the beauty of the cave. You’ll get great shots of the campsite on the beach (you can take photos from the cliffs above) and in late December to early March, you can photograph amazing sunbeams when the sun is shining.

You are unlikely to come across anything dangerous inside the cave. The cave is home to thousands of swifts in the nesting season, and there are many bats year-round. Please note that the bats do not carry rabies or other infectious diseases and are harmless. We ask that you respect them (and all wildlife) by not touching them or disturbing them in any way.

This tour is ranked Adventure Level 3 due to the long trek it takes to get there and back. The trek is about 10km each way and includes an enormous hill at the beginning and end of the tour. The last hour and a half coming up the hill at the end of the tour is the hardest part of the trip.

Yes. This tour starts with pickup between 08:00 – 08:30 AM in Phong Nha. If you plan on arriving on the morning of the tour by night bus/train, please make sure that you will be ready in the area before 07:30 AM.
The tour normally returns to Phong Nha around 05:00 – 05:30 PM the following evening, so you would be able to depart by night bus/train to head either north or south. If you choose to travel by flight, please make sure your flight departs no earlier than 07:30 PM.
Please check our Arrival & Departure guide for further information on buses and trains.

Excellent swimming skills are not required for this tour. All participants will be swimming 100m and wading while wearing life jackets - even if they are an expert swimmer. In addition, our safety assistants will always be around to support you when necessary.

The water temperature is quite stable, if a bit colder during winter at around 15 - 17 degrees Celsius.

During the swimming section, all electronic devices will be stored in a drumbox (100% waterproof) carried by the Oxalis Adventure team. The box's diameter is 15cm and height is 25cm. For the Hang Va Expedition, you don't need to carry a waterproof backpack as your luggage will be left on dry ground and put in a big plastic bag during the swimming section.

Please check the Arrival & Departure Guide on our website for more information.

The flying fox is about 15 meters in height and is only used in the rainy season (November through early March) to ensure safety.
This is not an extreme height by any means, and with the headlamps provided as well as full support from the Oxalis Adventure team with a guide, guide’s assistant and porters, each use of the flying fox will be finished within 2-3 minutes smoothly.
In the dry season, normally from late March to early August, we can walk and explore the cave without the use of the flying fox.

There are bats in some of the caves but they do not carry rabies or other infectious diseases, and they are harmless. We ask that you respect them (and all wildlife) by not touching them or disturbing them in any way.

While rock climbing skills are a great asset, it is not necessary to have any technical climbing experience to join this tour. There are some tight squeezes inside the cave and through the rocky path leading to the cave entrance.

Please check the Arrival & Departure Guide on our website for more information.

All electronic devices will be collected and stored in a dry-box (25cm high, 15cm diameter) by our tour guide before you start swimming. Please bring your own dry-box or dry-bag if you have very large cameras. Please note that you will have to carry your own camera if you have a professional and large camera and the same for its tripod.

The tour typically ends between 05:00 and 06:00 PM in Phong Nha. If you are planning on leaving Phong Nha immediately after the tour, please make sure that your bus departs Phong Nha no earlier than 06:30 PM or your train/ flight departs Dong Hoi city no earlier than 07:30 PM.

Yes, please feel free to stop to take photos along the way. While it is completely dark inside the caves, we do provide some lighting to help you capture the beauty of the caves.

Please check the Arrival & Departure Guide on our website for more information.

The total length of the caving in Hang Tien Exploration is about 6.5km, which is mainly walking inside the cave and admiring the cave. Other than that, on day 3, you will climb a ladder inside Hang Tien 1.

During the rainy season in Phong Nha (mid-September to mid-November), we close all tours for safety reasons as the caves are at risk of flooding. Apart from this period, there is only occasional rain that doesn’t affect the status of our tours. However, it is important to wear proper trekking shoes with good grip to have the best experience on the slippery jungle terrain when it rains.

As swimming through Hung Ton cave is part of the trek, you will be swimming with your trekking clothes on. Therefore, it is best to wear light and quick-dry materials. However, when you have settled at the campsite, please feel free to change into your swimsuits and enjoy a relaxing swim at the natural pool nearby.

Please check the Arrival & Departure Guide on our website for more information.

You are welcome to leave behind extra luggage at our office. Anything you choose to leave behind will get tagged and placed securely in our locked storage room. More valuable things like ID or wallet we will keep it in a separate room for more secure.

While climbing skills are a great asset, it is not necessary to have any technical climbing experience to join the Tu Lan Cave Encounter.

No, you cannot change your clothes during the tour. There is a lot of swimming combined with trekking and we don’t have time to change into dry clothes during the trek. When you reach the campsite, you can change and enjoy some warm drinks.

If you enjoy swimming and warm weather, we suggest you book the tour from April to August. If you are looking for a warm campfire at night, and cooler weather, you can book the tour between November and March. For safety reasons, there is less swimming in the caves if the air temperature is below 18 degrees Celsius. We will reduce the swimming part and do trekking combined with exploring the river caves by boat instead.