Print-friendlyThe longest caves list is updated to 1 February 2012. It has all the caves that have been surveyed to a length of over 1,000 m.
| No. | Name | Province | VR | Surveyors | Date |
|---|---|---|---|---|---|
| 1 | Tham Phra Wang Daeng | Phitsanulok | 13,844m | RFD/CSS/OCC/SMCC | 1997-2004 |
| 2 | Tham Mae Lana | Mae Hong Son | 12,720m | Australian expeditions | 1986-1992 |
| 3 | Tham Yai Nam Nao | Phetchabun | 10,422m | SMCC | 2004-2011 |
| 4 | Tham Nam Lang | Mae Hong Son | 8,550m | Australian expeditions | 1986 |
| 5 | Tham Takobi | Tak | 7,346m | SMCC | 2000-2003 |
| 6 | Tham Luang | Chiang Rai | 6,220m | APS | 1988 |
| 7 | Tham Krachaeng | Yala | 5,633m | Price et al. | 1993-2000 |
| 8 | Tham Chiang Dao | Chiang Mai | 5,190m | APS | 1985 |
| 9 | Tham Pung Hung | Mae Hong Son | 4,566m | Australian expeditions | 1990 |
| 10 | Tham Ban Nam Mut | Kanchanaburi | 4,161m | CSCA | 1992 |
| 11 | Tham Pha Mon | Mae Hong Son | 4,050m | APS | 1985 |
| 12 | Tham Khang Khao | Phitsanulok | 3,706m | RFD/CSS/SMCC/OCC | 2003-2004 |
| 13 | Tham Nok Nang En | Kanchanaburi | 3,230m | GSSS | 1988 |
| 14 | Tham Pha Phueng | Nan | 3,218m | SMCC/CSS | 2005-2010 |
| 15 | Tham Sua/Tham Lom | Mae Hong Son | 3,075m | Smart et al. | 1993 |
| 16 | Tham Nam Mut | Kanchanaburi | 2,938m | CSCA | 1992 |
| 17 | Tham Phu Khieo | Chaiyaphum | 2,866m | Checkley et al. | 1989 |
| 18 | Tham Nam Tok | Kanchanaburi | 2,710m | CSS | 1996 |
| 19 | Tham Loe Pu | Tak | 2,625m | SMCC | 2002 |
| 20 | Tham Susa | Mae Hong Son | 2,617m | Australian expeditions | 1992 |
| 21 | Tham Pha Sri Thamma Sokarat | Nakhon Si Thammarat | 2,200m | Page Ashwell | 2011 |
| 22 | Tham Kleab Yai | Chiang Mai | 2,190m | APS | 1988 |
| 23 | Tham Nam Dan | Phitsanulok | 2,102m | RFD/CSS/SMCC/OCC | 2002-2004 |
| 24 | Tham Lumphini Suan Hin | Saraburi | 2,019m | TCKG/SMCC | 1998-2003 |
| 25 | Tham Ki Mi | Chiang Mai | 1,912m | Alpinistyczny Klub Eksploracyjny w Sopocie | 1987 |
| 26 | Tham Than Lot | Tak | 1,866m | RFD/OCC | 1998 |
| 27 | Tham Huai Tong Thai | Tak | 1,819m | RFD/CSS/CSCA/TVCC | 2004 |
| 28 | Tham Nam Ru Hua Koa | Mae Hong Son | 1,806m | APS/Australian expeditions | 1986 |
| 29 | Tham Mae Pla Ao | Chiang Mai | 1,762m | Thailand Karst Hydrologic Survey & Zeitoun et al. | 1984-2008 |
| 30 | Tham Huai Kun | Mae Hong Son | 1,747m | Australian expeditions | 1986 |
| 31 | Tham Phra Sai Ngam | Phitsanulok | 1,712m | RFD/CSS | 1997 |
| 32 | Tham Tab Tao | Chiang Mai | 1,685m | SMCC | 2003 |
| 33 | Tham Lod | Mae Hong Son | 1,666m | Australian expeditions | 1983 |
| 34 | Tham Huai Chi Laeng | Chaiyaphum | 1,602m | Checkley et al. | 1989 |
| 35 | Tham Phu Pha Phet System | Phattalung | 1,599m | RFD/ACG | 2001-2002 |
| 36 | Tham Mae Usu | Tak | 1,586m | SMCC | 2003 |
| 37 | Tham Reua | Phitsanulok | 1,408m | RFD/OCC | 2003 |
| 38 | Tham Nam Tok | Mae Hong Son | 1,405m | Australian expeditions | 1986 |
| 39 | Tham Duean/Tham Dao | Phitsanulok | 1,382m | RFD/CSS | 1997 |
| 40 | Tham Pang Kham | Mae Hong Son | 1,370m | Australian expeditions | 1986 |
| 41 | Tham Pha Ngam | Lampang | 1,367m | SMCC | 2009-2010 |
| 42 | Tham Hued | Mae Hong Son | 1,365m | APS | 1988 |
| 43 | Tham Nam Phra Tat | Kanchanaburi | 1,332m | NZSS | 1992 |
| 44 | Tham Racha Phuttha | Phang Nga | 1,324m | SMCC | 2010-12 |
| 45 | Tham Pha Daeng | Mae Hong Son | 1,323m | Australian expeditions | 1988 |
| 46 | Tham Phaya Naak | Phetchabun | 1,285m | SMCC | 2003-2006 |
| 47 | Tham Tapan | Phang Nga | 1,250m | Australian expeditions | 1986 |
| 48 | Tham Pha Kaeo | Phitsanulok | 1,217m | RFD/OCC | 2004 |
| 49 | Tham Nam Hu | Mae Hong Son | 1,201m | Spies et al. | 1999 |
| 50 | Tham Pha Thai | Lampang | 1,185m | APS | 1985 |
| 51 | Tham Phung Chang | Phang Nga | 1,150m | APS | 1988 |
| 52 | Tham Mor | Tak | 1,139m | RFD | 1999 |
| 53 | Tham Sao Hin | Kanchanaburi | 1,130m | Australian expeditons | 1990 |
| 54 | Tham Plah | Surat Thani | 1,103m | BEC | 1998 |
| 55 | Tham Than Nam Lot Yai | Chumphon | 1,095m | APS | 1988 |
| 56 | Tham Chao Ram | Sukhothai | 1,091m | RFD/CSS | 1996-1997 |
| 57 | Tham Krata | Lamphun | 1,057m | BEC | 2001 |
| 58 | Tham Khun Huai Tum Lek | Phitsanulok | 1,035m | RFD/OCC | 2004 |
| 59 | Tham Mae Usa | Tak | 1,019m | SMCC | 2003 |