The Son Doon cave in Vietnam is the largest cave in the world. It is located in Phong Nha-Ke Bang National Park, and it is a monster of a cave. Extending 2.8 miles, it averages 262-by-262 feet in dimensions. The largest point is over 460-by-460 feet. Explorers say that the cave might be even longer, but flooding has halted continuing exploration.
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