A jungle inside a cave ... They named it the Great Wall of Vietnam. Above it they could make out an open space and traces of light, but they had no idea what lay on the other side.
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Hang Son Doong: The world's biggest cave, so 'outrageous in size' it fits 2 jungles and the 'Great Wall of Vietnam'The limestone cavern sits beneath a lush jungle in Vietnam's Phong Nha-Ke ... wall of calcite known as the Great Wall of ...
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