The Largest Underground Chambers by Surface Area (Floor) (by Volume page down)  
           
  C A V E     N A M E COUNTRY AREA m2 SOURCE DATE DIMENSIONS (meters)
1 Sarawak (Chamber) - Lubang Nasib Bagus Malaysia 154,530 Descent (245) P37 Aug-15 429 x 641 x 113
2 Miaos Room - Gebihe system China 140,540 Descent (245) P37 Aug-15 336 x 824 x 177
3 Torca del Carlista - La Grand Sala del GEV Spain 87,090 Descent (245) P37 Aug-15 287 x 497 x 97
4 Ghar -e- Dosar Iran 81,500 http://iransplo.com/newsDetail.aspx?mode=1&id=432 Jul-05 365 x 265
5 Xiniu (Rhino) Chamber - Salle Xiniu China 80,000 Wang Xun Yi, Cave Expeditions Jun-05 400 x 200
6 Gua payem Malaysia 70,580 Fabien Darne - List Jun-05  
7 Benua Chamber - Benua Sinkhole & Cave Papua New Guinea 70,500 Atlas - Great Caves of the World Jun-05  
8 One big room ? Laos 70,000 Fabien Darne - List Jun-05  
9 Majlis al Jinn - Majlis al Jinn Oman 61,000 Descent (245) P37 Aug-15  
10 Sistema TZ2-TZ7 - Grand Salle Mexico 60,000 Richard Grebeude Jun-05 200 x 300
11 Sistemul Humpleu - Sala Gigantilor Romania 59,607 http://sghbern.ch/romania/ Jun-05 537x111x35
12 Cloud Ladder Hall - Hong Meigui Cave China 57,460 Descent (245) P37 Aug-15 353 x 393 x 282
13 Hong Meigui Chamber - Hong Meigui Cave China 54,870 Descent (245) P37 Aug-15 269 x 468 x 197
14 Tit(an) Chamber China 54,750 Descent (245) P37 Aug-15 341 x 367 x 80
15 Belize Chamber - Actun Tun Kul Belize 49,000 Descent (245) P37 Aug-15  
16 Salle Tuke - Reseau Minye - Tevi Oro Papua New Guinea 48,000 http://fabien.darne.free.fr/speleo/grandes_salles/ Jun-05 240x200x130
17 Tlamanictli (TZ1) - Salle La Muneca Fea Mexico 46,377 Descent (245) P37 Aug-15 250 x 500
18 Weibu Chamber - Chijin Dong China 46,200 Wang Xun Yi, Cave Expeditions Jun-05 400 x 108
19 Salle de l'Eclipse - Gouffe des Partages France 43,470 Descent (245) P37 Aug-15 245 x 243 x 199
20 Entrance Chamber - Xiong Jia He Da Dong China 43,200 Wang Xun Yi, Cave Expeditions Jun-05  
21 Panayoran Chamber - Langun Cave Philippines 43,200 Speleologia No.17 Jun-05 270 x 140 x 40
22 Gouffre de la Martin - Salle de la Verna France 43,000 http://www.atm3d.com/v5/pdf/verna.pdf Jun-05 255 x 245 x 180
23 Gruta de Villa Garcia Mexico 40,820 Atlas - Great Caves of the World Jun-05  
24 Salon de Gigantes - Gruta del Palmito (Bustamante) Mexico 39,730 Fabien Darne - List Jun-05  
25 Tham Toutche - Swallow Cave Thailand 38,690 Fabien Darne - List Jun-05  
26 Deer Cave Malaysia 38,600 Roo Walters Oct-14 870 x 177 x 270
27 Api Chamber  (Whiterock Cave) Malaysia 38,000 Descent (245) P37 Aug-15 300x200x100
28 Gua Kepayang (Sungai Baai) Indonesia 37,800 http://fabien.darne.free.fr/speleo/grandes_salles/ ##### 270x140
29 Kocain Big Room - Kocain Cave Turkey 37,200 Atlas - Great Caves of the World Jun-05  
30 Entrance Chamber - Ganduan Dong China 37,000 Wang Xun Yi, Cave Expeditions Jun-05  
31 Carlsbad Cavern Big Room USA 33,210 Atlas - Great Caves of the World Jun-05  
32 Grotta Gigante Italy 33,120 Fabien Darne - List Jun-05 240 x 138 x 132
33 Sotano de las Golondrinas (open to surface) Mexico 33,110 Atlas - Great Caves of the World Jun-05  
34 Chiquibul (Chamber)  - Actun Kabal Belize 32,090 Atlas - Great Caves of the World Jun-05  
35 Martel Dom ou Martel's Chamber - Skocjanske jame Slovenia 32,090 Atlas - Great Caves of the World Jun-05 308 x 89 - 123 x 106
36 Sala Gabor Halasi (Sistemul Humpleu) Romania 31,930 http://fabien.darne.free.fr/speleo/grandes_salles/ Jun-05 310x103x35
37 Tham Phuphaphet  - Swallow Cave                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            Thailand 30,500 Axbridge Caving Group Journal Jun-05 1.03km loop
38 Xiji (Century) Chamber - West Cave, Leye China 27,500 Wang Xun Yi, Cave Expeditions Jun-05  
             
       The Largest Underground Chambers by Volume
           
  C A V E     N A M E COUNTRY AREA Mm3 SOURCE DATE L x W x H
1 Miaos Room - Gebihe system China 10.570 Descent (245) P37 Aug-15 824 x 336 x 177
2 Sarawak Malaysia 9.670 Descent (245) P37 Aug-15 641 x 429 x 113
3 Deer Cave Malaysia 6.310 Roo Walters Oct-14 870 x 177 x 270
4 Cloud Ladder Hall China 6.210 Descent (245) P37 Aug-15 393 x 353 x 282
5 Hong Meigui Chamber - Hong Meigui Cave China 5.250 Descent (245) P37 Aug-15 468 x 269 x 197
6 HMG China 5.250 Roo Walters Oct-14 474 x 226 x 212
7 Luse Papua New Guinea 5.000 Atlas - Great Caves of the World Jun-05  
8 Ghar -e- Dosar Iran 5.000 Descent (245) P37 Aug-15 365 x 265 x 
9 sotano de las Golondrinas (open to surface) Mexico 5.000 Atlas - Great Caves of the World Jun-05  
10 Korikobi Papua New Guinea 5.000 Atlas - Great Caves of the World Jun-05  
11 Benua Papua New Guinea 5.000 Atlas - Great Caves of the World Jun-05  
12 Majlis al Jinn - Majlis al Jinn Oman 4.090 Descent (245) P37 Aug-15  
13 Salle de la Verna France 3.650 Descent (245) P37 Aug-15 243 x 245 x 199
14 Ora     (Doline) Papua New Guinea 2.900 Atlas - Great Caves of the World Jun-05  
15 Minye     (Doline) Papua New Guinea 2.600 Atlas - Great Caves of the World Jun-05  
16 Titan China 2.530 Descent (245) P37 Aug-15 367 x 341 x 80
17 Torca del Carlista - La Grand Sala del GEV Spain 2.140 Descent (245) P37 Aug-15 497 x 287 x 97
18 sima mayor de Sarisarinama     (Doline?) Venezuela 1.800 Atlas - Great Caves of the World Jun-05  
19 sotano del Barro (open to serface) Mexico 1.500 Atlas - Great Caves of the World Jun-05  
20 Kavakuna Papua New Guinea 1.500 Atlas - Great Caves of the World Jun-05  
           
       The Largest Passage (Trunk/Borehole)
           
  C A V E     N A M E COUNTRY Size (Meters) SOURCE DATE
1 Han Son Doong Vietnam 5000x145x200 http://is.gd/uiin Apr-09 145,000 Mm3
             
2 Deer Cave Malaysia 4100x90x100 http://www.mulucaves.org Jul-05 36,9000 Mm3