The World's Largest Cave: It Has a Forest, a River, and Clouds Inside

Son Doong is the largest cave in the world. It is so huge that it has a completely self-sufficient ecosystem with its own climate conditions. Hundreds of meters underground, the usual clouds form in this cave.

Son Doong is even home to a pristine prehistoric rainforest hidden deep below the surface and a huge underground river. From translucent fish to colorful monkeys, over 250 endemic plant and animal species live in this subterranean world. Seven new animal species have recently been discovered and are unique to this place. The nine-kilometer-long cave holds 38.5 million cubic meters. The passages are so enormous that a 40-storey skyscraper would fit inside, and the huge stalagmites rise up like the towers of ancient cities. When you enter, you almost feel like a tiny insect. Son Doong even contains phytokarst rock that moves towards the sun like semi-living organisms. Rare cave pearls and many other unique formations can be found here.

For three million years since its formation, the world was unaware of its existence until it was fully explored in Vietnam in 2009. Now it's time to discover the largest cave in the world.

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