Hang Luon, A Tunnel Or A Cave
Hang Luon is a half submerged karst tunnel existing at the base of a limestone mountain and features a beautiful lake surrounded by towering limestone walls. Hang Luon Tunnel is usually known as Luon Cave. It’s considered a must-see destination for those visiting Halong Bay, tour providers and local authorities usually provide clear instructions on how to get there and the safety information.

How To Reach Hang Luon
Luon Cave is located at about 13 kilometers to the southeast from Tuan Chau Harbour, 1 kilometer further than Titov Island in the same direction.

From Bai Chay Wharf or Tuan Chau Wharf, you can go on a cruise ship whose itinerary includes Luon Cave, or hire a ship to go on your own tour. As the tunnel can only be passed through by boat, the cruise ship will stop outside Luon Cave, then you can hire a kayak to paddle yourself or hire a boat rowed by the locals to experience the stunning natural beauty and learn about the cave’s formation and history.

Formation Of Hang Luon
Karst tunnels are formed by the dissolution of limestone by water. Rainwater absorbs carbon dioxide from the air and soil, creating a weak carbonic acid. This acid then dissolves the limestone, creating underground caves and tunnels. Over time, these caves and tunnels can connect to form a large and complex network of underground passages.

The karst tunnels were formed by the dissolution of limestone by seawater. The bay is located in a region with high rainfall and a warm, humid climate. This creates a large amount of runoff, which flows into the bay and dissolves the limestone. As the water dissolves the limestone, it creates underground caves and tunnels. The seawater then flows into these caves and tunnels, creating a unique and fascinating underwater environment.

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Kayak At Hang Luon
The tunnel in Luon Cave leads into a spectacular natural formation that can only be accessed by smaller watercraft such as kayaks or dinghies. The low ceiling of the tunnel makes it impossible for larger ships like cruise ships to enter. The combination of towering limestone cliffs and the sparkling jade-green waters of the bay make Luon Cave a truly unique and awe-inspiring destination for kayaking. In the tourism season, Luon Cave is constantly crowded with travelers who come to experience this activity.

Kayaking can be a fun and enjoyable activity, but it is important to follow safety guidelines to ensure that you have a safe and enjoyable experience. Here are some general safety tips for kayaking in Halong Bay:

Check the weather forecast and water conditions before setting out. Avoid kayaking in inclement weather or rough water.
Wear a personal flotation device (PFD) at all times while kayaking.
Bring necessary safety equipment, such as a whistle, flashlight, and first aid kit.
Stay within your skill level and experience. Don’t take on more challenging routes or water conditions than you are capable of handling.
Stay aware of your surroundings and be mindful of other boats and vessels in the area.
Follow any rules or guidelines set by the kayaking operator or park authorities.
The most suitable time to visit Luon Cave is from February to June and September to October. At this time, the weather in Halong Bay is quite nice, which will make your trip more convenient.

Keep in mind, Halong Bay is a sensitive natural environment, please follow all the guidelines produced by the tour providers, or the local authorities, to minimize the impact on the environment and ensure the safety of all visitors.