1. MAMMOTH CAVE SYSTEM : KENTUCKY, USA:- 390.0 MILES (known length)

2. JEWEL CAVE : SOUTH DAKOTA, USA:- 150.0 MILES (known length)

 

3.OPTIMISTICESKAJA : UKRAINE :- 144.0 MILES (known length)

4. WIND CAVE : SOUTH DAKOTA, USA:- 136.0 MILES (known length)

5. SISTEMA SAC ACTUN : MEXIVO, USA:- 135.0 (known length)

6. LECHUGUILLA CAVE : NEW MEXICO, USA :- 130.0 

7. HOLLOCH: SWITZERLAND :- 122.0

8. CLEAR WATER SYSTEMS : MALAYSIA :- 117.0

9.FISHER RIDGE SYSTEM : KENTUCKY, USA :- 114.0

10. SISTEMA OX BEL HA , MEXICO :- 113.0