Son Doong Cave in Vietnam is known for being the largest cave in the world. It was first discovered by a local farmer in 1991, but the world only learned about it in 2009 through surveys by British cave explorers. The cave is about 9 kilometers long, 200 meters high, and 150 meters wide, with some parts even larger. The cave has its own ecosystem inside — underground rivers, lush forests, and even clouds and rain formed by light holes above. The cave walls are decorated with ancient calcium formations, some of which are millions of years old.
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