Sơn Đoòng cave (hang Sơn Đoòng, "Mountain River cave" in Vietnamese)[1] is a cave in Vietnam and the biggest known cave in the world. It has a large fast-flowing underground river inside.
Sơn Đoòng Cave was discovered by a local man in 1991. The local jungle men were afraid of the cave for the whistling sound it makes. It was not until 2009 that it became public after a group of British cave scientists conducted a survey.
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