Great Wall (Laos)
Khammouan
The Great Wall in Laos refers to a vast flowstone-coated natural wall located within the world's largest cave system, Hang Sơn Đoòng, near the Laos-Vietnam border. This immense cave passage, formed in soluble Carboniferous/Permian limestone, features the largest known cross-section of any cave worldwide. The Great Wall itself is a towering 60-meter-high natural formation within the cave, acting as a significant obstacle that explorers had to traverse to reach the cave's full length. The cave system extends over 9 kilometers and includes enormous dolines allowing sunlight to nurture unique ecosystems inside. This natural wonder showcases remarkable stalagmites reaching heights of up to 80 meters and contains cave pearls of unusually large size. The cave's immense scale is such that it can accommodate a city block or even a Boeing 747 airplane within its chambers. Access to the cave and the Great Wall is highly regulated to preserve its delicate environment, with restricted tourism permits available only during certain months. The site is also part of a UNESCO World Heritage area, emphasizing its global significance and need for conservation.
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Tip: Visitors should plan their trip between January and August when permits to explore the cave are available, as the cave is closed during the monsoon season from September to December due to flooding risks. Booking tours in advance is essential since access is limited and managed by authorized operators like Oxalis Adventure Tours. Proper physical preparation is recommended given the challenging terrain, including navigating the Great Wall within the cave. Respecting conservation rules ensures the preservation of the cave's unique ecosystem.
Interesting facts
- •The Great Wall is a 60-meter-high flowstone-coated natural wall inside the world's largest cave system, Hang Sơn Đoòng.
- •Hang Sơn Đoòng cave passage is over 5 kilometers long, 200 meters high, and 150 meters wide, making it the largest known cave passage by volume.
- •The cave contains stalagmites up to 80 meters tall, among the tallest in the world.
- •Sections of the cave receive sunlight through collapsed ceilings called dolines, allowing trees and vegetation to grow inside.
- •The cave's interior is large enough to fit a New York city block or allow a Boeing 747 to fly through without its wings touching the sides.
History
The entrance to the cave system containing the Great Wall was first discovered in 1990 by a local man searching for agarwood but was only rediscovered and explored starting in 2008 by the British Cave Research Association.
The Great Wall was named during the 2009 expedition when explorers encountered the 60-meter-high flowstone wall that initially blocked their progress.
By 2010, the wall was successfully traversed, allowing the full extent of the cave system, exceeding 9 kilometers, to be mapped.
The cave formed over millions of years through the dissolution of limestone and has since become a significant natural landmark near the Laos-Vietnam border.
Place Guide
The Great Wall of Vietnam2009
A massive 60-meter-high flowstone-coated natural wall inside Hang Sơn Đoòng cave, named by explorers during the 2009 expedition. It was a significant obstacle that had to be climbed to explore the cave fully.
Doline Ecosystems
Large collapsed sections of the cave ceiling that allow sunlight to enter, supporting unique vegetation and ecosystems within the cave interior.
Stalagmites
Some of the tallest known stalagmites in the world, reaching up to 80 meters in height, found within the cave passage near the Great Wall.