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.
Mount Augustus, Western Australia Mount Augustus is widely claimed in tourist promotional and information literature as the "world's largest monolith",[3][4] but the claim does not originate from the geological literature, nor is substantiated by any other scholarly research.[5]