Dark Cave
Zipline, swim, and explore darkness.
4.4 ⭐ (2.1K)
Introduction
Dark Cave (Hang Tối) is an adventure-focused cave experience located within Phong Nha-Ke Bang National Park. Unlike its neighbors, this cave system is kept in its natural, unlit state, requiring visitors to explore with headlamps. The experience is defined by a combination of adrenaline activities, including a 400-meter zipline to the entrance, swimming in the cool Chay River, and navigating the cave to reach a therapeutic natural mud bath deep inside.
Zipline Across the Chay River
The tour begins with a thrilling 400-meter zipline from a stilted tower directly to the cave's entrance. This provides a superb aerial view of the river's distinct emerald-green water and the surrounding limestone karst landscape. It is one of the longest ziplines in Vietnam.
The Natural Mud Bath
The ultimate destination inside the cave is a large chamber filled with dense, buoyant mud. With no artificial lights, you navigate through narrow passages with only a headlamp before floating effortlessly in the mineral-rich mud pool.
Kayaking and River Activities
After exploring the cave and washing off the mud in the Chay River, the experience continues with kayaking. Visitors paddle back to the main station, with opportunities to stop at various water-based obstacle courses, smaller ziplines, and water swings.
Exploring the Unlit Cave
Equipped with a helmet and headlamp, you'll wade and climb through the dark passageways of the cave. The darkness preserves the raw feel of the cave, and your headlamp will illuminate ancient fossils visible on the stone walls.
Getting there
From Phong Nha Town to Dark Cave (approx. 20 km):
🚗 Taxi: 25-30 mins | 250,000 - 350,000 VND ~ $10 - $14 USD one way.
🛵 Motorbike: 30-40 mins. This is a popular option, allowing you to travel at your own pace. The roads are paved and offer good views of the park.
🚘 Organized Tour: Most day tours from Phong Nha or Dong Hoi will include Dark Cave as a stop, bundling transport with the ticket price.
⚠️ There are no practical public transport options. Renting a motorbike is the most common and flexible way to explore the park. Be sure to have a full tank of gas before you leave Phong Nha town.
Hours & Admission
🕗 Opening hours:
- Monday - Sunday: 7:30 AM - 5:30 PM
- Notes: Last entry for the full tour is typically around 3:30 PM. Hours may be reduced during the rainy season (October - December) for safety reasons.
🎫 Ticket prices:
- Full Package (Zipline, Cave, Mud Bath, Kayaking):
- High Season (April 1st - Sept 15th): 450,000 VND ~ $18 USD per person.
- Low Season (Sept 16th - March 31st): 250,000 VND ~ $10 USD per person.
- River Activities Only (No Cave/Mud Bath): 200,000 VND ~ $8 USD per person.
- Children: Children under 1.4m may have different activities and pricing.
- Notes: Tickets are purchased at the entrance. The price includes all necessary equipment such as a life jacket, helmet with headlamp, and locker usage.
🚶 Best time to visit:
- The best time to visit is during the dry season, from April to August, when the weather is hot and the cool water of the Chay River is most refreshing. To avoid the largest crowds, plan your visit for a weekday morning or later in the afternoon.
⌚ Recommended duration:
- Allow at least 3 to 4 hours to complete the entire circuit of activities without feeling rushed.
Tips from locals
Local tips
👗 Wear your swimsuit under your clothes. This will save you time and hassle, as the changing rooms can get busy. You will get completely wet and muddy, so choose swimwear and clothes you don't mind getting dirty.
🔐 Use the provided lockers for all your valuables, including phones, wallets, and non-waterproof cameras. You cannot take these items into the cave, and it's better to secure them before you start the zipline.
⚖️ Be aware of the zipline's weight restrictions. There is a minimum weight of 40kg (88 lbs) and a maximum of 90kg (200 lbs). Staff will check before allowing you on the zipline.
💡 The natural mud in the cave is extremely buoyant, much more so than water. Don't panic or try to "swim". Just lean back, relax, and you will float effortlessly on the surface. It's a unique sensation.
Be aware
👨👩👧👦 During peak season (June-August) and on weekends, this attraction becomes extremely popular. Expect significant queues for the main zipline and a very crowded experience inside the mud bath chamber.
🥶 The water in the Chay River is sourced from underground springs and can be surprisingly cold, even on hot days. Be prepared for a chilly shock when you swim to the cave entrance and wash off the mud afterward.
FAQs
What should I wear to Dark Cave?
Wear a swimsuit. You can wear shorts and a t-shirt over it. Avoid heavy clothing like jeans. You will be provided with water shoes if you don't have appropriate footwear.
Is there a weight limit for the Dark Cave zipline?
Yes, the weight limit for the main zipline is between 40kg (88 lbs) and 90kg (200 lbs).
Can I bring my phone or camera inside the cave?
No, you cannot take non-waterproof electronics into the cave. It's dark, wet, and muddy. It is highly recommended to bring a waterproof camera like a GoPro if you want to capture the experience.
How long does the full Dark Cave experience take?
Plan for about 3-4 hours to enjoy all the activities, including the zipline, mud bath, cave exploration, and kayaking.
Do I need to be a strong swimmer?
You don't need to be a strong swimmer as you will be wearing a life jacket at all times while in the water. However, you should be comfortable in the water.
Is the mud in the mud bath clean?
The mud is natural, mineral-rich clay that is part of the cave's ecosystem. The water that you use to rinse off comes directly from the river.
Are there lockers to store my belongings?
Yes, lockers are provided and the cost is included in your ticket price. You will be given a key on a wristband.
Is Dark Cave suitable for children?
It depends on their height, weight, and confidence. Children must meet the 40kg minimum weight for the main zipline. Lighter children or those not wanting to do the cave have alternative options, like kayaking and the smaller water park.
How is Dark Cave different from Paradise Cave or Phong Nha Cave?
Dark Cave is an adventure-focused experience with no artificial lights, focusing on activities like ziplining and a mud bath. Paradise Cave and Phong Nha Cave are sightseeing caves with extensive lighting systems and wooden walkways or boats to showcase the stalactites and stalagmites.
Should I book Dark Cave tickets in advance?
It is generally not necessary to book in advance. You can buy tickets directly at the entrance. However, if you are visiting during a major public holiday, booking through a tour operator might be a good idea.
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