| Long Piping Caves Jan. 2020 DOUG MEDVILLE & Bob Gulden | ||||||||||
| LENGTH | DEPTH | |||||||||
| Cave Name | State | County | length (ft.) | MILES | METERS | depth (ft.) | METERS | Reference | comment | |
| 1 | B&B Caverns | NM | San Juan | 2685.0 | 0.509 | 821.436 | 325.0 | 99.06 | D.Medville | |
| 2 | Christmas Canyon Cave | WA | Cowlitz | 2637.0 | 0.499 | 803.758 | 0.00 | W.R. Halliday, Ency. Of Caves, pg 591 | mudflow beneath lava | |
| 3 | Anvil Points Claystone C. | CO | Garfield | 2063.0 | 0.391 | 628.802 | 187.0 | 57.00 | D. Wolfe, RMC Vol 24, no. 1 | |
| 4 | Marzev Kidron | Israel | Dead Sea | 1572.0 | 0.298 | 479.146 | 0.00 | Boaz Langford | ||
| 4 | Stairstep Canyon C. | NM | San Juan | 1181.0 | 0.224 | 359.969 | 331.0 | 100.89 | D. Medville, B. Richards | |
| 5 | Hidden Cave | CA | San Diego | 1154.0 | 0.219 | 351.739 | 0.00 | B. Richards, Cal Cave Vol 39, no. 2 | ||
| 6 | Officers Cave | OR | Grant | 1132.0 | 0.214 | 345.034 | 0.00 | W.R. Halliday, Ency. Of Caves, pg 591 | ||
| 7 | Carey's Big Mud C. | CA | San Diego | 1120.0 | 0.212 | 341.376 | 51.0 | 15.54 | B. Richards, Cal Cave Vol 39, no. 2 | |
| 8 | Chasm Cave | CA | San Diego | 1010.0 | 0.191 | 307.848 | 24.0 | 7.32 | B. Richards, Cal Cave Vol 39, no. 2 | |
| 9 | Kemach Cave | Israel | Dead Sea | 899.0 | 0.170 | 274.000 | 73.8 | 22.49 | Boaz Langford | |
| 10 | Hidden Canyon Cave | CA | Riverside | 879.0 | 0.166 | 267.919 | 128.0 | 39.01 | B. Richards, The Explorer, June 1984 | |
| 11 | Pipe Dream Cave | CO | Mesa | 805.0 | 0.152 | 245.364 | 73.0 | 22.25 | D. Medville | |
| 12 | Upper Dominguez Cave | CO | Mesa | 761.0 | 0.144 | 231.953 | 135.0 | 41.15 | D. Medville | |
| 13 | Lower Dominguez Cave | CO | Mesa | 717.0 | 0.136 | 218.542 | 136.0 | 41.45 | D. Medville | |
| 14 | Cathedral Canyon C. | NM | San Juan | 666.0 | 0.126 | 202.997 | 77.0 | 23.47 | D. Medville, B. Richards | |
| 15 | Magnificent Morrison Cave | CO | Delta | 657.0 | 0.124 | 200.254 | 64.0 | 19.51 | D. Medville | |
| 16 | Mind Benter Cave | NM | San Juan | 607.0 | 0.115 | 185.014 | 45.0 | 13.72 | D. Medville | |
| 17 | Little Mud Cave | CA | San Diego | 604.0 | 0.114 | 184.099 | 0.00 | B. Richards, Cal Cave Vol 39, no. 2 | ||
| 18 | Majestic Canyon C. | NM | San Juan | 601.0 | 0.114 | 183.185 | 155.0 | 47.24 | D. Medville, B. Richards | |
| 19 | E-Ticket C. | CA | San Diego | 583.0 | 0.110 | 177.698 | 38.0 | 11.58 | B. Richards, Cal Cave Vol 39, no. 2 | |
| 20 | King Kutz Cave | NM | San Juan | 576.0 | 0.109 | 175.565 | 145.0 | 44.20 | D. Medville | |
| 21 | Canyon Climb Cave | CO | Delta | 572.0 | 0.108 | 174.346 | 156.0 | 47.55 | D. Medville | |
| 22 | Blue Beer Cap Cave | NM | San Juan | 546.0 | 0.103 | 166.421 | 56.0 | 17.07 | D. Medville | |
| 23 | Slickrock C. | CO | Mesa | 527.0 | 0.100 | 160.630 | 59.0 | 17.98 | D. Medville | |
| 24 | Finale Cave | CO | Mesa | 499.0 | 0.095 | 152.095 | 65.0 | 19.81 | R. DeLano, RMC Vol 13, no. 1 | |
| 25 | Raven Cave | CO | Mesa | 452.0 | 0.086 | 137.770 | 57.0 | 17.37 | D. Medville | |
| 26 | Hidden Canyon Cave | NM | San Juan | 448.0 | 0.085 | 136.550 | 30.0 | 9.14 | D. Medville, B. Richards | |
| 27 | Bedding Plane C. | CA | San Diego | 441.0 | 0.084 | 134.417 | 57.0 | 17.37 | B. Richards, Cal Cave Vol 39, no. 2 | |
| 28 | Svyataya Cave | Russia | Gatchina | 427.0 | 0.081 | 130.150 | 0.00 | Euro Speleo Magazine p46 1/1/12 | sandstone | |
| 29 | Mudnificent Cave | NM | San Juan | 425.0 | 0.080 | 129.540 | 66.0 | 20.12 | D. Medville | |
| 30 | May Day Cave | NM | San Juan | 420.0 | 0.080 | 128.016 | 115.0 | 35.05 | D. Medville | |
| 31 | Maybe Cave | NM | San Juan | 415.0 | 0.079 | 128.016 | 0.00 | D. Medville | ||
| 32 | Old Spanish Trail C. | CA | Inyo | 415.0 | 0.079 | 126.492 | 23.0 | 7.01 | B. Szukalski | |
| 33 | Wedged Rock C. | CO | Mesa | 410.0 | 0.078 | 124.968 | 61.0 | 18.59 | D. Medville | |
| 34 | Mesa C. | CO | Mesa | 398.0 | 0.075 | 121.310 | 57.0 | 17.37 | D. Medville | |
| 35 | Tabeguache-Zephyr C. | CO | Mesa | 397.0 | 0.075 | 121.006 | 32.0 | 9.75 | D. G. Davis, RMC Vol 9, no. 2 | |
| 36 | Cold Climb Cave | NM | San Juan | 394.0 | 0.075 | 120.091 | 119.0 | 36.27 | D.Medville | |
| 37 | Skylight Cave | CA | San Diego | 389.0 | 0.074 | 118.567 | 0.00 | B. Richards, Cal Cave Vol 39, no. 2 | ||
| 38 | Double Ladder Cave | NM | San Juan | 362.0 | 0.069 | 110.338 | 113.0 | 34.44 | D. Medville | |
| 39 | Coaled Comfort C. | NM | San Juan | 362.0 | 0.069 | 110.338 | 36.0 | 10.97 | D. Medville, B. Richards | |
| 40 | Wrecked Car Canyon Cave | NM | San Juan | 356.0 | 0.067 | 108.509 | 85.0 | 25.91 | D. Medville, B. Richards, C. Vesely | |
| 41 | Climbdown Cave | CO | Montrose | 354.0 | 0.067 | 107.899 | 50.0 | 15.24 | D. Medville | |
| 42 | Amargosa River Cave #2 | CA | Inyo | 344.0 | 0.065 | 104.851 | 22.0 | 6.71 | B. Szukalski | |
| 43 | Coyote Cave | CO | Montrose | 340.0 | 0.064 | 103.632 | 65.0 | 19.81 | D.Medville | |
| 44 | Canyoneering Cave | NM | San Juan | 337.0 | 0.064 | 102.718 | 0.0 | 0.00 | D.Medville, C.Vesely | |
| 45 | Escalante C. | CO | Delta | 336.0 | 0.064 | 102.413 | 34.0 | 10.36 | D. Medville | |
| 46 | Pestera Aven | Romania | 334.600 | 0.063 | 102.000 | 42.7 | 13.01 | Liviu Valenas | Loess | |
| 47 | Footprint C. | CA | San Diego | 334.0 | 0.063 | 101.803 | 38.0 | 11.58 | B. Richards, Cal Cave Vol 39, no. 2 | |
| 48 | Big Mud Flow Cave | CA | San Diego | 329.0 | 0.062 | 100.279 | 0.00 | C. Vesely | ||