Son Doong : Vietnam
Sơn Đoòng Cave (Vietnamese: Hang Sơn Đoòng ([haːŋ˧ ʂəːn˧ ɗɔ̤ŋ˨˩]); 'cave of the mountain river' or 'mountain cave of Đoòng [village]' in Vietnamese), is a solutional cave in Phong Nha-Kẻ Bàng National Park, Bố Trạch District, Quảng Bình Province, Vietnam. As of 2009 it has the largest known cave passage cross-section in the world, and is located near the Laos–Vietnam border. Inside is a large, fast-flowing subterranean river. It was formed in Carboniferous/Permian limestone and is believed to be between 2 and 5 million years old
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