<Tr> <Th> Cave survey </Th> <Td> 2009, British / Vietnamese </Td> </Tr> <P> Sơn Đoòng Cave ((haːŋ ˧ ʂəːn ˧ ɗɔ̤ŋ ˨ ˩)) is in Phong Nha - Kẻ Bàng National Park, Bố Trạch District, Quảng Bình Province, Vietnam . </P> <P> Located near the Laos--Vietnam border, Hang Sơn Đoòng has an internal, fast - flowing subterranean river and the largest cross-section of any cave, worldwide, as of 2009, believed to be twice that of the next largest passage . It is the largest known cave passage in the world by volume . </P> <P> Its name, Hang Sơn Đoòng, is variously translated from Vietnamese as' cave of the mountain river' or' mountain cave of Đoòng (village)' . </P>

Where is the world's largest cave located