<P> 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 . </P>
<P> 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 . </P>
where is the largest cave in the world located
where is the largest cave in the world located
Phong Nha - Kẻ Bàng National Park , Bố Trạch District , Quảng Bình Province , Vietnam
Phong Nha - Kẻ Bàng National Park , Bố Trạch District , Quảng Bình Province , Vietnam