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Outstanding sinkholes

Great Blue Hole, Belize
Great Blue Hole, Belize / Chris Alnatt,, public domain.

Here are selected some of the most surprising and interesting sinkholes of the the world, arranged by the part of the world and in an alphabetic order.


Often it is mentioned that Qattara Depression in Matruh Governorate, Egypt, is the largest sinkhole in the world. This feature is approximately 19,500 km² large, up to 360 m deep. Borders of this structure are not very well defined - in nothern part it has precipice, in southern there is gradual rise without cliffs. Mechanism of its formation is not fully clear. As a whole it has little in common with sinkholes.

  • Bushmangat - South Africa. Flooded cave chamber with opening above. Depth 264 m, opening only 30 m long and 12 m across but deeper it becomes larger.
  • Chinhoyi Caves - Mashonaland West, Zimbabwe. Group of legendary, impressive caves with up to 110 metres deep lakes. Extremely high transparency of water where clouds and birds flying over can be seen from 30 metre depth inside the cave lake.
  • Lake Guinas - Namibia. 145 m long, 70 m wide and 132 m deep lake. Endemic fish - Tilapia guinasana Trewavas, 1936.
  • Mangily sinkhole - Diana, Madagascar. The largest sinkhole in Ankarana karst region, up to 700 m across and 140 m deep. Volume - 25 million m³.


Bala'a sinkhole, Lebanon
Bala'a sinkhole, Lebanon / Wikimedia Commons by user Elie plus, CC-BY-SA-3.0
  • Baidong tiankeng - Guangxi, China. Very deep sinkhole, up to 312 m deep, opening up to 220 m wide. Adjacent to giant cave room.
  • Bala'a sinkhole and waterfall (Baatar) - Lebanon, North. Approximately 255 m deep, nearly vertical cave with waterfall in it. Entrance in the cave is some 70 m deep sinkhole. Here waterfall has percolated one side of sinkhole, creating three natural bridges one above the other. Waterfall disappears underground.
  • Dashiwei tiankeng - Guangxi, China. Enormous tiankeng, up to 613 metres deep, 600x420 metres across.
  • Dragon Hole - South China Sea, Paracel Islands. World's deepest known undersea sinkhole, 300.89 m deep.
  • Garden of Eden - Sarawak, Malaysia. Possible world's largest sinkhole which from three sides is surrounded with 150 - 300 m high vertical walls. This is former giant cave chamber with two giant caves (Deer Cave and Green Cave) still continuing in both sides of Garden of Eden. Volume - 150 million m³, size 1,200 x 1,000 m.
  • Haolong tiankeng - Guangxi, China. One of the largest sinkholes of the world by volume, with degraded walls. Depth up to 509 m, width up to 800 m. Volume 110 million m³.
  • Khammouan dolines - Khammouan, Laos. Limestone mountains contain more than 350 collapse sinkholes, up to 230 million m³ large. Considered to be the largest concentration of large collapse dolines in the world. Many collapse sinkholes contain unknown amount of endemic species, most are not explored. Some dolines are accessible only by air.
  • Layla Lakes - Ar Ryadh, Saudi Arabia. Largest gypsum sinkholes, former lakes which have drained now. In total 23 sinkholes, up to 1,100 m long, up to 50 m deep, with vertical walls. Especially impressive feature is the beautiful, unique gypsum tufa formations covering the walls of sinkholes.
  • Ascending from the floor of Majlis al Jinn, Oman
    Ascending from the floor of Majlis al Jinn, Oman / Wikimedia Commons, CC-BY-SA-3.0
    Majlis al Jinn - Sharqiah, Oman. Formally this is cave as it still is covered with ceiling - but there have formed three holes in the ceiling, allowing direct, 118 - 158 m tall descent into this enormous void. Ninth largest cave chamber in world in unique setting. People are living on the top of this enormous chamber which has only 40 metres thick ceiling.
  • Qingkou tiankeng - Chongqing Municipality. The most impressive erosion tiankeng, with several waterfalls falling into it, vertical walls. Up to 295 m deep, up to 250 m wide, volume 9.2 million m³. The giant Er Wang Dong cve starts here.
  • Qinlong tiankeng - Chongqing Municipality. One of the most impressive complexes of natural attractions in the world. Very impressive, enormous sinkhole, up to 276 m deep, up to 520 m wide, volume 31.7 million m³. With the giant Qinlong natural arch connected to nearby Shenying tiankeng - up to 285 m deep, 300 m wide. Both tiankengs have two more exits through natural arches - Qinlong tiankeng can be exited through two Tianlong Natural bridges, Shenying tiankeng - through Hailong natural bridge.
  • Sendirian sinkhole (Solo sinkhole) - Sarawak, Malaysia. Visually very impressive sinkhole, up to 240 m deep. At surface level the hole is up to 115 m wide, but the walls are overhanging and below it is larger, with enormous stalactites hanging over the patch of jungle below.
  • Taipingmiao tiankeng - Chongqing Municipality, China. Very impressive sinkhole, up to 420 m deep, with round 180 m wide opening.
  • Tawi Atair - Dhofar Governorate, Oman. Enormous collapse doline, 211 m deep, with vertical walls around. Below, in cave lake lives endemic fish - the only freshwater fish in 600 km radius.
  • Teiq Sinkhole - Dhofar Governorate, Oman. One of the largest sinkholes in the world, up to 250 m deep, 1 km wide, volume 90 million m³. Here enter two perennial streams which disappear underground in the middle of sinkhole.
  • Tongtian tiankeng - Guizhou, China. Very deep and distinct sinkhole. Depth 370 m, opening up to 210 m wide. Volume 7.2 million m³. Getu underground river flows through the tiankeng.
  • Yogoluk sinkhole - Papua, Indonesia. Up to 240 m deep and 180 m wide sinkhole with vertical walls, formed over underground river.
  • Xiaoyanwan tiankeng - Sichuan, China. Giant, partly degraded sinkhole, up to 248 m deep, up to 625 m wide, volume 36 million m³.
  • Xiaozhai tiankeng - Chongqing, China. Largest sinkhole (tiankeng) in the world, up to 662 metres deep, 625x535 metres across.

Australia and Oceania

  • Kavakuna - East New Britain, Papua New Guinea. Enormous tiankeng, located in exotic jungle. Up to 480 metres deep, 380 - 300 metres across, with vertical wall in one side.
  • Kukumbu sinkhole - West New Britain, Papua New Guinea. Partially degraded giant sinkhole, formed above Arrakis cave. Up to 300 metres deep, 1000 metres across, volume 75 million m³.
  • Lusé sinkhole - East New Britain, Papua New Guinea. Giant sinkhole with volume 61 million m³, depth up to 250 m. No vertical cliffs, covered with forest.
  • Sinkholes of Mamo Plateau - Southern Highlands Province, Papua New Guinea. Unique group of more than 100 giant sinkholes located close together. Volume of the largest sinkholes reaches 31 million m³, their walls though are not vertical.
  • Minyé sinkhole and cave - East New Britain Province. One of the largest and most impressive tiankengs (giant sinkholes) in world, located in exotic jungle and crossed by powerful underground river. Up to 510 metres deep, 350 metres across, volume - 26 million m³. It continues as a cave system. Explored length of cave passages is 5,421 m, maximum depth - 468 m. Contains one of the largest cave rooms in the world - Tuké room, 240 m long, 200 m wide and 130 m high.
  • Naré sinkhole - East New Britain Province. One of the most spectacular sinkholes in the world, also located in exotic jungle. Up to 310 metres deep, up to 150 metres across, volume - 4.7 million m³. Walls are overhanging, below flows a powerful river. At the top part of sinkhole, inside it often form clouds. Further cave reaches 415 m depth.
  • Ora sinkhole - East New Britain, Papua New Guinea. Degraded but beautiful sinkhole with volume 26 million m³, depth up to 275 m, width up to 900 m. Double sinkhole with rock bridge in the centre.


Crveno Jezero sinkhole, Croatia
Crveno Jezero sinkhole, Croatia / Tieum512, Wikimedia Commons, CC BY 3.0
  • Crveno Jezero (Red Lake) - Split-Dalmatia, Croatia. One of the most impressive sinkholes in the world: deep shaft with lake at the bottom. Total depth of sinkhole is roughly 530 m, it contains 280 - 290 m deep lake with endemic fish.
  • Pozzo del Merro - Lazio, Italy. The second deepest known water filled cave in the world with at least 392 m deep waterbody, total measured depth - 472 m, formed in Triassic limestone. This is nearly vertical cave - the upper part of it is a sinkhole.
  • Velika Dolina and Mala Dolina - Slovenian Littoral, Slovenia. Two closely located enormous sinkholes. Velika Dolina is up to 165 m deep, 300 by 177 m wide. Mala Dolina is up to 130 m deep, 170 by 120 m large.


North America

  • Black Hole of Andros - South Andros, Bahamas. Flooded sinkhole with a layer of violet jelly layer of bacteria at 18 metres depth. Microorganisms have heated the water up to 40 degrees C°.
  • Dean's Blue Hole - Long Island, Bahamas. 202 metres deep sinkhole in the sea, the entrance is only 25 - 35 metres across.
  • El Zacatón sinkhole - Tamaulipas, Mexico. World's deepest water-filled vertical shaft, 339 metres deep sinkhole with 319 metres deep lake. Floating islands in the lake.
  • Great Blue Hole - Belize District, Belize. Perfectly round undersea sinkhole, 318 metres across and 124 metres deep.
  • Hoya de las Guaguas - San Luis Potosi, Mexico. Sinkhole - cave of giant size. Entrance shaft is 202 m deep, total depth 478 m, cave chamber up to 290 m tall. Thousands of swifts and parrots live in the sinkhole.
  • Neversink Pit - Alabama, United States. Visually very impressive 50 m deep sinkhole, 12 m wide at surface and 30 m wide at the bottom. Night time visit is very impressive as there are numerous glowworms on the walls of pit. Waterfalls.
  • Poza Seca - Tamaulipas, Mexico. One of the unique travertine capped sinkholes in Sistema Zacatón: formerly open sinkhole has sealed itself with a limestone lid. Most likely it hides unknown life forms, not investigated.
  • Sacred Cenote - Quintana Roo, Mexico. Human sacrifice site of the ancient Mayan Chichen Itza city. In deposits discovered huge amounts of gold and jade artefacts as well as human remains.
  • Vermilion Creek sinkhole - Northwestern Territories, Canada. Impressive sinkhole in gypsum layers. Walls are vertical, at 40 metre depth is located lake of unknown depth.
  • Caver rappelling down into the Sótano de las Golondrinas
    Caver rappelling down into the Sótano de las Golondrinas. / Stubb, Wikimedia Commons, Free Art License
    Sótano del Barro - Querétaro, Mexico. One of the largest sinkholes of the world, 455 m deep, with 410 m direct fall. Width - 420 m, formed in Lower Cretaceous limestone.
  • Sótano de la Culebra - Querétaro, Mexico. Narrow sinkhole with total depth of 360 m, free fall - 336 m.
  • Sótano de las Golondrinas (Cave of Swallows) - San Luis Potosí, Mexico. The largest cave shaft in the world - enormous 49 x 62 metres wide hole, 372 metres deep. Famous due to a group of green parrots who have to fly ascending in circles around the cave until they get out of it.
  • Tres Pueblos Sinkhole - Puerto Rico. Nearly circular sinkhole, 180 m wide, 120 m deep, with vertical walls. Unedrground river flows through the sinkhole.
  • X'kekén Cenote (Dzitnup Cenote) - Yucatán, Mexico. One of the most photographed cenotes, with beautiful deep blue lake and sun beam lighting it through the ceiling, numerous stalactites. At least 35 m across, distance between the ceiling and water is some 20 m.

South America

Sima Humboldt and Sima Martel, sinkholes in Venezuela
Sima Humboldt and Sima Martel, sinkholes in Venezuela / Luis Ruiz Berti, public domain.
  • Lago Azul – Goiás, Brazil. Water-filed sinkhole, dived up to 274 m depth.
  • Peruaçu North and Peruaçu South – Minas Gerais, Brazil. Two giant sinkholes above the underground part of Peruaçu River - Janelão river cave. Sinkholes are up to 170 m deep, up to 450 m long. Volume of Peruaçu North is 10 million m³.
  • Sima Aonda - Bolivar, Venezuela. 383 metres deep, ancient quartzite sinkhole, with waterfall and stream flowing through it.
  • Sima Humboldt and Sima Martel - Bolivar, Venezuela. 314 and 248 metres deep, ancient quartzite sinkholes located on the top of forested table-top mountains and containing patches of isolated, primeval rainforest on their bottoms.

Other articles about sinkholes

Map of described sinkholes

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