10 longest caves in the world

10. Fisher Ridge Cave System

• length: 209.2 km
• location: Kentucky, United States
• year of discovery: 1981

9. Clearwater Cave System

fot. Sunrise Odyssey from Singapore / wikipedia.org (CC BY-SA 2.5)

• length: 236.8 km
• location: Sarawak, Malaysia
• year of discovery: 1978

8. Lechuguilla Cave

fot. Dave Bunnell / wikipedia.org (CC BY-SA 2.5)

• length: 242 km
• location: New Mexico, United States
• year of discovery: 1900

7. Wind Cave

• length: 248.1 km
• location: South Dakota, United States
• year of discovery: 1881

6. Optymistychna Cave

• length: 257 km
• location: Ternopil region, Korolivka, Ukraine
• year of discovery: 1966

5. Shuanghedong Cave Network

• length: 257.4 km
• location: Suiyang, China
• year of discovery: 1988

4. Sistema Ox Bel Ha

• length: 271 km
• location: Quintana Roo, Mexico
• year of discovery: 1996

3. Jewel Cave

fot. Pi3.124 / wikipedia.org (CC BY-SA 4.0)

• length: 334.8 km
• location: South Dakota, United States
• year of discovery: 1900

2. Sistema Sac Actun

fot. anjči from London, UK / wikipedia.org (CC BY-SA 2.0)

• length: 371.9 km
• location: Yucatan, Mexico
• year of discovery: 1987

1. Mammoth Cave

• length: 667.8 km
• location: Kentucky, United States
• year of discovery: 1791