List of longest caves
Caves are found around the world. The largest form in areas of karst landforms whose rocks erode easily and create caves. Preferable conditions for cave formation are adequate precipitation, enough plants and animals to produce ample carbon dioxide, and a landscape of gentle hills which drains slowly. The highest concentrations of long caves in the world are found in the Pennyrile of Southern Kentucky, United States, in the Black Hills of South Dakota, United States, and in the Yucatán Peninsula, Mexico.
- Bob Gulden (January 10, 2016). "Worlds longest caves". Geo2 Committee on Long and Deep Caves. National Speleological Society (NSS). Retrieved January 10, 2016.
- "List of Long Underwater Caves in Quintana Roo Mexico". Quintana Roo Speleological Survey. NSS. January 1, 2014. Retrieved January 7, 2014.
- Eavis, Rob (April–May 2016). "What a Rollercoaster". Descent (249): 24–29.