Phong Nha-Ke Bang National Park
The Phong Nha-Ke Bang National Park in Vietnam contains the oldest karst system in Asia and is between 400-450 million years old. It is also here, where the largest cave in the world was ...
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The Phong Nha-Ke Bang National Park in Vietnam contains the oldest karst system in Asia and is between 400-450 million years old. It is also here, where the largest cave in the world was ...
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