5 Longest Caves In The World (In Km)
| S. No. | Name | Length |
|---|---|---|
| 1. | Mammoth Cave, Brownsville, Kentucky, United States | 685.6 Km |
| 2. | Sistema Ox Bel Ha, Tulum, Quintana Roo, Mexico | 435.8 Km |
| 3. | Shuanghedong Cave Network, Guizhou, China | 400.7 Km |
| 4. | Sistema Sac Actun/Sistema Dos Ojos, Tulum, Quintana Roo, Mexico | 386.1 Km |
| 5. | Jewel Cave, Custer, South Dakota, United States | 346.0 Km |
Source: Wikipedia