List of longest cavesFrom Wikipedia, the free encyclopedia This list of longest caves includes caves in which the combined length of documented passageways exceeds 100 kilometres (62 mi). In some of these caves, passageways are still being discovered.[1][2] Mammoth Cave, the world's longest known cave system
This list of longest caves includes caves in which the combined length of documented passageways exceeds 100 kilometres (62 mi). In some of these caves, passageways are still being discovered.[1][2] Mammoth Cave, the world's longest known cave system