Where is the world's largest cave system with 345 km of mapped passageways?
Martin Ridge Cave System the caves' lowest elevation passageways. Currently, at least a one-kilometer (3,300-foot) gap exists between the two caves' closest known reaches. Martin Ridge Cave System The Martin Ridge Cave System is a large cave near Mammoth Cave, in the U.S. state of Kentucky. The system, composed of the interconnected Whigpistle, Martin Ridge, and Jackpot Caves, has been mapped to over , and is currently the United States' thirteenth-longest cave. The original entrance to the system, Whigpistle Cave, was discovered by Rick Schwartz in 1976. Mapping was initiated by the National Park Service under the supervision of park hydrologist Jim Quinlan in
Chiquibul Cave System Chiquibul Cave System The Chiquibul Cave System is one of the largest and best-known cave systems in Central America. It consists of four distinct caves along the course of the Chiquibul River; Actun Kabal, Actun Tun Kul (Tunkul) and Cebada Cave in Belize, and Xibalba in Guatemala, as well as several other smaller associated caves. Included within the cave system are two of the largest underground chambers in the world. This upper section of the Chiquibul Cave System has over 12 km of mapped passages with a depth of -95 m. Included is Chiquibul Chamber, at 250 m by 150