Sơn Đoòng Cave (hang Sơn Đoòng, "Mountain River cave" in Vietnamese) is a solutional cave in Phong Nha-Kẻ Bàng National Park, Bố Trạch District, Quảng Bình Province, Vietnam. As of 2009[update] it is the biggest known cave in the world,[2][3] and is located near the Laos–Vietnam border. Inside is a large, fast-flowing underground river. It is formed in Carboniferous / Permian limestone.[4]
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