where is the world's largest cave located
Hang Sơn Đoòng 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,[1][2] believed to be twice that of the next largest passage. It is the largest known cave passage in the world by volume.