Overview:
Dark Cave, also known as Hang Toi, is one of the most famous adventure destinations in Phong Nha – Ke Bang National Park, about 50km from Dong Hoi city center. Discovered in 1990, Dark Cave quickly became a major tourist attraction due to its wild beauty and unique experiences.
With a length of up to 6km, Dark Cave is a complex cave system with many branches and nooks. What is special here is that the artificial lighting system is rarely used, creating the feeling of discovering a completely new world. Visitors will experience the feeling of walking through slippery clay paths, wading through small streams, and exploring magical stalactites.
One of the most attractive activities in Dark Cave is mud bathing. The mud here is said to contain many minerals that are good for the skin, helping to relax the body. After the mud bath, visitors can relax on floats and drift along the water. In addition, visitors can also participate in other activities such as ziplining, kayaking, and exploring caves with flashlights.
Dark Cave is not only an attractive tourist destination but also has great scientific value. The unique ecosystem inside the cave is a valuable resource for scientists to study.
The Mysterious History of Dark Cave
Dark cave is the result of millions of years of complex geological formations. This place used to be a vast ocean. Billions of tiny creatures lived and died, their shells settling on the seabed, forming dense layers of sediment. Over time, under high pressure and temperature, these sediment layers gradually turned into limestone.
Strong geological activities caused the seabed to rise, forming majestic limestone mountains. Rainwater seeped through cracks in the limestone, carrying carbonic acid that dissolved part of the limestone, forming underground caves.
For millions of years, rainwater continued to seep into the caves, eroding the limestone, and creating strange shapes such as stalactites and stalagmites. At the same time, the flow of water also contributed to the expansion and formation of new cave branches.
Discovering the Hidden Wonders of Dark Cave

Dark Cave is not only famous for its adventurous experiences but also possesses a system of extremely unique and attractive geological formations. These natural sculptures are the result of millions of years of geological tectonics, creating a mysterious and attractive beauty. Visitors can admire the giant stalactites and stalagmites growing from the ground, the giant stone pillars connecting the ceiling and floor of the cave.

Dark Cave is also home to many wild animals, especially bats, Ha Tinh langurs and swiftlets. Thousands of bats live in the cave, creating an impressive scene when they fly out of the cave at dusk. In addition, Dark Cave is also home to Ha Tinh langurs, a rare and endangered primate species.
Dark Cave also has important historical significance in the Vietnam War. During the resistance war against the US, the cave was used as a shelter and base for the Vietnamese army. Relics of the war still remain in the cave such as tunnels, carved stone walls, and soldiers’ daily necessities.
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What to do in Dark Cave
Besides the mysterious stalactites and stalagmites, Dark Cave always offers visitors interesting experiences such as Ziplining, kayaking in Chay river, and mad buth.
Chay River Kayaking:

Kayaking at Chay River Dark Cave is an activity that visitors should experience to both exercise and admire the beautiful natural scenery. Visitors have the opportunity to admire the majestic limestone mountains, with mysterious caves hidden in the mountains. In addition, admire the wild beauty of the tropical forest, with rare and diverse plants. Enjoy the cool feeling when gliding on the clear water of Chay River. When kayaking on the Chay River, visitors need to:
- Prepare life jackets, swimsuits, hats, sunglasses, sunscreen
- Listen carefully to the tour guide about how to paddle, safety skills on the river, and environmental regulations.
- New kayakers should have time to get acquainted and practice basic skills before starting the journey
The best time to kayak is during the dry season: February to August, when the river water level is stable and the weather is cool. During the rainy season from September to January, the river water level rises, creating small waterfalls and adding to the excitement of the trip. However, you need to pay attention to the weather during this time to ensure your safety.
Zipline experience at Chay river Dark Cave

In contrast to the peaceful and serene kayaking experience, Zipline offers an exciting and thrilling adventure that visitors should not miss at Song Chay Dark Cave. When participating in the zipline activity, visitors will be able to admire the breathtaking panoramic view that opens up below – the calm waters of the poetic Chay River winding through the landscape. The aerial journey will end at the entrance of Hang Toi, where a whole new adventure awaits visitors as they prepare to explore the fascinating depths of the cave and discover the secrets hidden within.
Why should you try Song Chay Zipline?
This is a truly unique and unforgettable experience that allows visitors to explore the breathtaking beauty of Phong Nha Ke Bang National Park from a completely new and exciting perspective.
The zipline system is carefully managed by a professional and well-trained team, prioritizing the safety of visitors. With modern equipment and thorough safety instructions, you can feel completely secure when starting this exciting adventure.
In addition, visitors will also admire the breathtaking panoramic view. In the air, visitors will see the majesty in all splendor of Song Chay Dark Cave, surrounded by towering limestone mountains that pierce the sky. The pristine landscape stretches to the horizon, creating a beautiful natural picture.
National mud bath in Dark Cave

Mud bathing in a dark cave is an extremely interesting experience. The mineral mud in the cave contains a treasure trove of valuable minerals that help visitors deeply cleanse their skin, improve blood circulation, reduce stress and provide nutrients for the skin.
The mud in the dark cave also changes with each season. In the summer, the mud is usually dark brown, smooth in texture, helping to cool the body. In the winter, the mud is light gray, slightly rough in texture, helping to keep the body warm. This change has created unique experiences for visitors.
Travel Tips for Visiting Dark Cave in Phong Nha – Ke Bang
Ticket price of Chay River – Dark Cave
There are 2 different types of tickets to visit the Chay River – Dark Cave tourist area that you can consider choosing. Specifically:
- Package ticket: 450,000 VND/person. Visitors can experience all the games inside this tourist area, including: mud bath, zipline, life jackets, headlamps, helmets when exploring the cave, …
- Separate ticket: 270,000 VND/person. With this type of ticket, you will only experience a few separate services such as: kayaking, Chay River bathing, Zipline.
How to get to Dark Cave
To get to Dark Cave, visitors can consider two routes by boat, motorbike or private taxi:
From Phong Nha boat station, visitors travel by boat along the Son River for about 1 km. From there, follow the Chay River for about 5 km to Dark Cave.
In addition, visitors can rent a motorbike or take a private taxi from Dong Hoi city center to Phong Nha Ke Bang National Park. This route offers the opportunity to admire the beautiful scenery along the way and explore the diverse ecosystem of Phong Nha.
No matter which means of transport you choose, the journey to Dark Cave will be interesting and the beauty of the surrounding nature will surely amaze you.
Read more: How to get from Dong Hoi to Phong Nha
Dark Cave with its magical stalactite system, unique wildlife and profound historical values, is truly a treasure of nature. Let’s join hands to protect this cave, so that future generations still have the opportunity to explore and admire its magical beauty.


Phong Nha Taxi believes in always bringing safety and satisfaction to customers when using private car services. A team of professionally trained drivers ensures a safe and enjoyable trip, tailored to your specific needs. Some routes that Phong Nha Taxi offers you: