The 20 Deepest Caves in the World: A Travel Guide to Record-Setting Cave Systems

1. Krubera-Voronja Cave, Georgia/Abkhazia

Deepest cave in the world - Krubera Voronja Cave

Krubera-Voronja Cave is listed as the deepest cave in the world, with a surveyed depth of 2,224 meters and a length of about 23 kilometers. It sits in the Arabika Massif, the same limestone region that holds several of the world's deepest known systems. The cave has several known entrances, with high entrances in the Ortobalagan Valley, and its passages drop through a cold, vertical limestone system.

Krubera matters because it was the first cave explored beyond the 2,000-meter depth mark. For years, it defined what deep-cave expeditions could achieve. The route involves narrow shafts, cold water, waterfalls, and flooded sections known as sumps, which require specialist cave-diving support. For travelers, Krubera is best understood as a record-setting expedition cave rather than a place to add to a sightseeing itinerary.

2. Veryovkina Cave, Georgia/Abkhazia

Veryovkina Cave is second on the list, with a surveyed depth of 2,209 meters and a length of about 17.5 kilometers. Its entrance is small compared with the scale of the system below, which is one reason the cave has such a strong reputation among deep-caving teams. The entrance area lies high in the Arabika Massif, between the Krepost and Zont mountains.

The cave was first recorded during Soviet-era exploration and was later named in memory of cave diver Alexander Veryovkin. Modern expeditions pushed the known depth much farther between 2016 and 2018, which is why many recent articles still describe Veryovkina as the deepest cave in the world. The current Wikipedia ranking places Krubera-Voronja above it, so this guide follows that ordering.

3. Sarma Cave, Georgia/Abkhazia

Sarma Cave reaches 1,830 meters deep and extends for about 19.2 kilometers. Like Krubera and Veryovkina, it lies in the Arabika Massif. The cave was discovered in 1990 and is known for a layered structure that includes upper dry passages and deeper aquatic zones.

Sarma is not a tourist cave. Its value in a travel guide is mainly geographical: it shows how concentrated the world's deepest cave systems are in this part of the Caucasus. Research in the system has also recorded cave-adapted aquatic life, which makes Sarma relevant not only to cavers but also to biologists studying isolated underground habitats.

4. Tovliani Cave, Georgia/Abkhazia

Tovliani Cave is listed at 1,760 meters deep and about 40.8 kilometers long. This is an important correction to older top-ten lists, which often include Snezhnaya Cave at this rank. Based on the current Wikipedia list, Tovliani is the fourth deepest cave in the world.

For travelers, the main point is that Tovliani is another expedition cave in Georgia/Abkhazia, not a public visitor cave. Its appearance in the top five also shows why cave rankings need current sourcing. Deep-cave lists can shift when survey teams connect systems, revise measurements, or publish newer depth data.

5. Lamprechtsofen, Austria

Lamprechtsofen, also called Lamprechtshöhle, is the fifth deepest cave in the world, with a listed depth of 1,727 meters and a length of about 61 kilometers. It is in Austria's Salzburg region, near Weißbach bei Lofer, in the Leogang Mountains. The system is unusual among the world's deepest caves because much of its exploration developed from the lower entrance upward rather than from a high entrance downward.

This is also one of the few caves on the list with a public section. A lower show-cave route has been open to visitors for more than a century, although it represents only a tiny part of the full system. For travelers who want a realistic connection to the deepest-caves list, Lamprechtsofen is far more practical than the expedition systems in the Caucasus.

6. Gouffre Mirolda, France

Gouffre Mirolda is listed at 1,661 meters deep and about 22 kilometers long. It is in Haute-Savoie in the French Alps. The cave's name combines the first letters of three young cavers, Michel Schmidt, Roland Chenevier, and Daniel Trouilleux, who died in a separate cave-flooding accident in 1976.

Mirolda has moved in and out of record discussions over time because deep-cave measurements can change after recalibration or new survey work. Expeditions pushed the known depth through the 1980s, 1990s, and early 2000s, with cave divers playing a role in the lower flooded sections. For travelers in the region, it is better treated as a speleological landmark than as a practical attraction.

7. Gouffre Jean-Bernard, France

Gouffre Jean-Bernard reaches 1,612 meters deep and has about 29.5 kilometers of surveyed passage. It is also in the French Alps, near Samoëns. The cave system is named for Jean Dupont and Bernard Raffy, two cavers connected with its early discovery who died in an unrelated climbing accident.

The system once held the title of deepest cave in the world, and it remains one of Europe's major deep-caving sites. Multiple entrances are scattered across the mountain, but that does not make it accessible in a tourist sense. Deep routes involve technical rope work, water hazards, and long underground travel.

8. Sistema del Cerro del Cuevón, Spain

Sistema del Cerro del Cuevón is Spain's deepest cave system on the current list, with a depth of 1,589 meters and a length of about 7 kilometers. It is in Asturias, in the Picos de Europa. Exploration began in the late 1990s with French and Spanish teams mapping a system that is much more vertical than horizontal.

The short length compared with its depth hints at the nature of the cave: steep, direct, and technically demanding. This is not the kind of cave that pairs with a normal hiking trip in northern Spain. It belongs to the specialist side of the Picos de Europa, a region better known to most travelers for mountain scenery, villages, and walking routes.

9. Hirlatzhöhle, Austria

Hirlatzhöhle is listed at 1,560 meters deep and about 117.8 kilometers long. It lies in Austria's Dachstein karst region near Hallstatt. The cave is notable not only for depth but also for its long surveyed network, which makes it one of the more extensive systems in the top 20.

Access is the issue. The deep parts of Hirlatzhöhle require serious expedition planning, and some entrances involve dangerous terrain or technical approaches. Travelers visiting Hallstatt should not confuse the presence of famous caves in the Dachstein region with easy access to Hirlatzhöhle's deep sections.

10. Sistema Huautla, Mexico

Sistema Huautla is also listed at 1,560 meters deep, with about 100.2 kilometers of mapped passage. It is in the Sierra Mazateca of Oaxaca, Mexico, and is the deepest cave system in the Western Hemisphere on the Wikipedia list. The system has many entrances and a long history of international expeditions.

Huautla is known for large underground waterfalls, long underground camps, and difficult lower passages. Its scale makes it important for cave researchers, but the deep system is for specialist teams, not general tourism. Travelers in Oaxaca should treat it as part of the region's cave geography rather than a conventional attraction.

11. Chevé Cave, Mexico

Chevé Cave is listed at 1,538 meters deep and about 87.2 kilometers long. It is also in Oaxaca, a region with several major deep cave systems. Chevé and Huautla together make southern Mexico one of the most important deep-caving areas outside Europe and the Caucasus.

12. Boybuloq Cave, Uzbekistan

Boybuloq Cave reaches 1,523 meters deep and has about 19.9 kilometers of surveyed passage. It is in Uzbekistan, making it one of the strongest entries from Central Asia in the top 20. For travel readers, the key point is access: this is a remote expedition cave, not a developed visitor site.

13. Pantyukhin Cave, Georgia/Abkhazia

Pantyukhin Cave is listed at 1,508 meters deep and about 7.9 kilometers long. It adds another Georgia/Abkhazia entry to the ranking and reinforces how unusual the Arabika Massif is for vertical cave development. Like the other deep Caucasus systems, it belongs in an expedition context.

14. Sima de la Cornisa, Spain

Sima de la Cornisa reaches 1,507 meters deep and has a listed length of about 6.4 kilometers. It is in Spain, in the same broad Picos de Europa deep-caving region as Sistema del Cerro del Cuevón and Sistema del Trave. The short mapped length and major depth suggest a steep technical system.

15. Čehi 2, Slovenia

Čehi 2 is listed at 1,505 meters deep and about 5.5 kilometers long. It is in Slovenia, a country well known for karst landscapes and cave tourism, though this particular system is not comparable to an ordinary visitor cave. Its position in the top 20 shows how strong the Julian Alps and nearby karst areas are for deep cave development.

16. Sistema del Trave, Spain

Sistema del Trave is listed at 1,441 meters deep and about 9.1 kilometers long. It is another Spanish system in the Picos de Europa area. For a travel guide, it helps explain why Asturias and northern Spain appear repeatedly in deep-cave rankings, even though most tourists know the region better for mountains, villages, and hiking.

17. Lukina-Trojama System, Croatia

The Lukina-Trojama system reaches 1,431 meters deep and is about 3.7 kilometers long. It is in Croatia's Velebit mountain range. The cave is an expedition site, but its location is useful for travelers interested in karst landscapes because Velebit is one of Croatia's most important mountain and cave regions.

18. Egma Sinkhole, Turkey

Egma Sinkhole is listed at 1,429 meters deep and about 3.1 kilometers long. It is in Turkey. The name itself gives a clue to the type of feature: a deep vertical sinkhole system rather than a broad tourist cave. Any visit would be expedition-oriented.

19. Gouffre de la Pierre Saint-Martin, France/Spain

Gouffre de la Pierre Saint-Martin reaches 1,410 meters deep and has about 88.1 kilometers of passage. It straddles the France-Spain cave region in the Pyrenees. Unlike many shorter vertical systems, it combines major depth with a long mapped network, which makes it important in European cave history and surveying.

20. Kuzgun Cave, Turkey

Kuzgun Cave is listed at 1,400 meters deep and about 3.1 kilometers long. It is the twentieth cave on the current Wikipedia ranking. Like Egma Sinkhole, it is a Turkish deep-caving system and should be treated as an expedition cave, not a visitor attraction.

Depth versus volume: the Son Doong Cave perspective

The list above ranks caves by vertical depth, not by size, volume, or visitor experience. That distinction is important because Son Doong Cave in Phong Nha-Ke Bang National Park, Vietnam, is not one of the deepest caves in the world. Its importance comes from volume: Guinness World Records recognizes Son Doong as the largest natural cave in the world by volume, at about 38.5 million cubic meters.

For travelers, that difference matters. The deepest caves in this ranking are mostly narrow, cold, vertical systems for professional cavers. Son Doong is a giant horizontal cave passage that can be visited only through a licensed guided expedition. It is still physically demanding, but it is a very different kind of cave experience from descending more than a kilometer into a technical shaft system.

Jungle Boss Tours operates guided cave expeditions in Phong Nha-Ke Bang National Park. The Hang Pygmy Cave expedition takes visitors to one of the world's largest cave chambers and includes an underground beach campsite. The Tiger Cave system is more demanding, with jungle trekking, swimming, and rope sections in Central Vietnam's limestone forest. For a wider planning overview, see the comprehensive guide to Phong Nha caves.