The Son Doong Cave in Vietnam is the largest cave passage in the world. This huge and intricate cave system was created by water that percolated down from a rainforest above, ultimately carving into the rock.
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You cannot visit Son Doong Cave alone. Noone is allowed to visit Son Doong Cave without the permission of the management board of Phong Nha – Ke Bang National Park. Son Doong cave is located in the core zone of Phong Nha Ke Bang national park.
Swimming is not a requisite for the Son Doong Expedition, as there are no required swimming sections. However, you have the option to take a dip and enjoy a swim at the Hang En cave – the world's 3rd largest cave.
Underwater caves exist either in limestone (formed by dissolving of the rock by weakly acidic groundwater) or in lava (created as lava tubes during volcanic eruptions).
The Geological History of the Jenolan CavesScientists have determined, through the examination of the clay found in the caves, that the Jenolan subterranean system is around 340 million years old. This makes it the oldest known and dated open cave system in the world, and it is still being heavily researched today.
7. Animal planet. It's often said that Hang Son Doong has its own ecosystem, and in some ways that's true. You may come across an array of wildlife while inside the cave, including howling monkeys near the ceiling collapses, translucent cave insects, squeaking bats and blind fish.