1 Grind Shaft
The entrance was found in 1985, and the shaft has grown from one campaign to the next: 23 consecutive pitches along the main route, with tributary shafts and inlets, typical of an alpine pothole. The national record came on 8 December 2019, and since 2023 the fight has played out at −775 m, around an advanced bivouac, with drainage works, digging and repeated sump dives.
- Total vertical range
- 815 m (−804 / +11)
- Length
- 1,500 m Surveyed; the new 2025 passages (over 60 m) are not yet fully surveyed.
- Massif · area
- Piatra Craiului · Dâmbovicioara, Argeș County
- Entrance
- 1,922 m altitude
- Discovery
- Entrance found in 1985; systematic exploration since the 1990s.
- Other names
- Avenul de sub Colșii Grindului; Avenul din Colșii Grindului
- Teams
- Silex Brașov · Focul Viu București · Avenul Brașov
- Exploration
- Active. The international camp of 26 September – 14 October 2025 pushed the terminus to −804 m (estimated) and opened a new, deeper sump. The Grind 2026 expedition is scheduled for 19 September – 4 October 2026.
- Access
- Authorised research / exploration The entrance lies in Piatra Craiului National Park. Any trip requires a CPS permit and the park administration's approval; there is no public access.
- Protection
- Piatra Craiului National Park; class B; paleoclimatic importance.
Why it matters
- The national vertical-range record since 8 December 2019, then beaten by itself, in the same shaft.
- An advanced bivouac at −775 m, where a team spent 9 consecutive days in 2025.
- A single 69 m pitch (the Walter Gutt pitch) descended in one go.
Sources
- Speologie.org — Grind record (815 m; −804; +11; 1,500 m; alt. 1,922 m; class B)
- Speologie.org — #grind2025 camp (26.09–14.10.2025): terminus −804 m estimated, new deeper sump, 9-day bivouac at −775 m
- Speologie.org — Grind 2026 calendar (19.09–04.10.2026, Silex Brașov + Focul Viu București)
- avenulgrind.ro — About (1985 discovery, 23 pitches, −69 m pitch, synonyms)
Last checked: 14 September 2026.
2 Vărășoaia System (V5–V24)
V5 was long synonymous with the record: the deepest known point in Romania, until Grind overtook it in December 2019. Since then, connections with neighbouring potholes have turned it into the Vărășoaia System (V5–V24), with 28 kilometres of passages and explorations continuing under the informal “Vărășoaia Team” umbrella.
- Total vertical range
- 653 m (−653 / +0)
- Length
- 28,000 m
- Massif · area
- Bihor Mountains · Padiș, Bihor County
- Entrance
- 1,367 m altitude
- Discovery
- Systematically explored since the 1970s–80s (reaching −273 m in 1992); national depth record until December 2019.
- Other names
- Avenul V5; Sistemul Vărășoaia
- Teams
- CS Z Oradea · Politehnica Cluj · Cristal Oradea · Vărășoaia Team
- Exploration
- Active. The Vărășoaia 2026 International Camp brought together 63 participants from 11 clubs and institutions: exploration, surveying, research and dives in the Padiș–Vărășoaia karst.
- Access
- Caving / technical access The system lies in Apuseni Nature Park. Access requires the administrator's agreement and, where required, a CPS permit; the through-trip is technical, on rope.
- Protection
- Apuseni Nature Park.
Why it matters
- The national record before Grind: −653 m, entirely below the entrance.
- 28 kilometres of passages — the third-longest system in the country.
- One of the few Romanian systems explored in annual international camps.
Sources
- Speologie.org — Vărășoaia System record (653 m; −653; 28,000 m; alt. 1,367 m)
- Speologie.org — Vărășoaia 2026 International Camp, report (63 participants, 11 clubs)
Last checked: 14 September 2026.
3 Șura Mare Cave
With its enormous portal at Ohaba-Ponor, Șura Mare has been known for over a century, and documented exploration began in 1929. The underground river climbs through domes and large chambers, and the upstream sumps (Englezilor, Verde, Afluent 6) have been passed by divers.
- Total vertical range
- 425 m (−0 / +425)
- Length
- 11,694 m
- Massif · area
- Șureanu Mountains · Ohaba-Ponor, Hunedoara County
- Entrance
- 460 m altitude
- Discovery
- Documented exploration since 1929 (Toma Ienciu); through-trips and surveys in the following years.
- Teams
- SpeoTimiș · Focul Viu
- Exploration
- Dormant in recent sources. No campaigns announced in 2025–2026; monitored as a scientific reserve.
- Access
- Caving / technical access Class A: activities only under CPS-authorised regimes, with the custodian's agreement. Not a show cave.
- Protection
- Scientific reserve; class A.
Why it matters
- This page's textbook case: 425 m of vertical range, but zero metres below the entrance.
- An underground river navigable upstream, with sumps passed by diving.
- Romania's tenth-longest cave (11,694 m).
Sources
- Speologie.org — Șura Mare record (425 m; 0; +425; 11,694 m; alt. 460 m; class A)
- Springer, Cave and Karst Systems of Romania — vertical range +425 m
Last checked: 14 September 2026.
4 Tăușoare Cave
Found in 1955 by a local teacher, Tăușoare became a mineralogical legend: gypsum formations, mirabilite and rare minerals, cave bear bones, long and hard-to-reach passages. Some sources list it at 19 kilometres — until the complete 2014 resurvey reset it to 8,650 m and 409 m.
- Total vertical range
- 409 m (−328 / +81)
- Length
- 8,650 m Post-2014-resurvey figure.
- Massif · area
- Rodnei Mountains · Rebrișoara, Bistrița-Năsăud County
- Entrance
- 942 m altitude
- Discovery
- Discovered in 1955 by the teacher Leon Bârte.
- Other names
- Peștera Tăușoare; Izvorul Tăușoarelor
- Teams
- Bistrița-Năsăud Museum Complex (custodian)
- Exploration
- Active. The first speleotourism group was reportedly admitted in May 2026, with a CPS permit (briefing information, no dedicated public document identified). Monitoring and research continue under the museum complex custodian.
- Access
- Authorised speleotourism Class A, but with an authorised speleotourism route: small groups, custodian guides (Bistrița-Năsăud Museum Complex), CPS permit. Not an ordinary tourist attraction — access is scheduled and approved.
- Protection
- Class A; Natura 2000 site ROSCI0193; custodian Bistrița-Năsăud Museum Complex.
Why it matters
- Minerals that made it famous in the specialist literature (mirabilite, rare sulphates).
- The only top-10 cave with authorised speleotourism.
- This page's case study in how old figures get corrected.
The complete 2014 resurvey: 8,650 m and 409 m of vertical extent — the ranking figures. Older sources give 18–20 km and 413–479 m.
Sources
- Speologie.org — Tăușoare record (409 m; −328; +81; 8,650 m; alt. 942 m; class A)
- Site management plan (2014 resurvey: 8,650 m, 409 m)
- CPS permits on mmediu.ro (small teams, custodian guides)
Last checked: 14 September 2026.
5 Secăturii Cave
Secăturii Hill Cave belongs to one system with Coliboaia Cave, in the Sighiștel Valley basin — a connection that united the efforts of several generations of Arad cavers and was published as a system in 2008.
- Total vertical range
- 390 m (−390 / +0)
- Length
- 2,990 m
- Massif · area
- Bihor Mountains · Sighiștel Valley, Bihor County
- Entrance
- The entrance altitude is not published in the Speologie.org record.
- Discovery
- The Secăturii–Coliboaia system, published in 2008 (Speomond 13); exploration by Arad clubs.
- Other names
- Sistemul Secăturii–Coliboaia
- Teams
- Speodava · Speowest · CSA · Liliacul Arad
- Exploration
- Dormant in recent sources. No campaigns announced in 2025–2026 in the sources consulted.
- Access
- Caving / technical access Caving access, with the custodian's/administrator's agreement and a CPS permit where required. No public access.
- Protection
- Apuseni Nature Park; class not published in the record consulted.
Why it matters
- One system with Coliboaia Cave.
- 390 m of uninterrupted descent below the entrance — fifth in the country.
- Explored through sustained digging by the Arad clubs.
Sources
- Speologie.org — Secăturii record (390 m; −390; 2,990 m)
- Speomond 13 (2008) — the Secăturii–Coliboaia system
Last checked: 14 September 2026.
6 Valea Rea Cave
Valea Rea is a mineralogical museum of world stature: over 30 minerals identified, four reported for the first time in the world in a cave environment, and Romania's richest gypsum speleothems. That is exactly why access is limited to research.
- Total vertical range
- 372 m (−372 / +0)
- Length
- 16,357 m
- Massif · area
- Bihor Mountains · Padiș, Bihor County
- Entrance
- 1,350 m altitude
- Discovery
- Attested at the latest in the Systematic Catalogue of Caves (1982); research by CS Z Oradea.
- Teams
- CS Z Oradea
- Exploration
- Dormant in recent sources. No campaigns announced in 2025–2026; protected mineralogical-laboratory status.
- Access
- Authorised research / exploration A very strict regime in Apuseni Nature Park: research and conservation only, with the administrator's and CPS approvals. Old rigging is degraded; Salvaspeo Bihor lists it as high risk.
- Protection
- Apuseni Nature Park; exceptional mineralogical importance.
Why it matters
- Over 30 minerals, including 4 world firsts in caves.
- The country's richest gypsum speleothems.
- 16.3 km of passages — Romania's seventh-longest cave.
Older sources give about 20 km of length; the current record: 16,357 m.
Sources
- Speologie.org — Valea Rea record (372 m; −372; 16,357 m; alt. 1,350 m)
- Onac et al. — Valea Rea mineralogy (Theoretical and Applied Karstology)
- Salvaspeo Bihor — Red List (high risk, degraded rigging)
Last checked: 14 September 2026.
7 Stanul Foncii Shaft
Stanul Foncii Shaft descends −339 m through a double system: the main shaft and a “parallel system”, entered through a narrow hole 7 m from the main entrance, with the Sala Mare — 60 by 20 m, over 20 m high — and cave bear bones.
- Total vertical range
- 339 m (−339 / +0)
- Length
- 4,106 m
- Massif · area
- Pădurea Craiului Mountains · Roșia, Bihor County
- Entrance
- 660 m altitude
- Discovery
- Description published in 1984 (CSER Cluj); earlier exploration in the area.
- Teams
- CSER Cluj
- Exploration
- Dormant in recent sources. No campaigns announced in 2025–2026 in the sources consulted.
- Access
- Caving / technical access Caving access, with the custodian's/administrator's agreement and a CPS permit where required. Not a show cave.
- Protection
- Apuseni Nature Park; class not published in the record consulted.
Why it matters
- Two shafts in one: a main system + a parallel system.
- Sala Mare: 60 × 20 m and over 20 m high.
- Ursus spelaeus bones in a side passage of the chamber.
Sources
- Speologie.org — Stanul Foncii record (339 m; −339; 4,106 m; alt. 660 m)
- CSER Cluj, Peștera no. 1/1984 — the shaft description
Last checked: 14 September 2026.
8 Humpleu System
Humpleu is a horizontal giant that enters the depth top almost in passing: 36.6 kilometres of passages make it Romania's second-longest system, and among them −314 m add up too. The Poienișa shaft belongs to the same complex.
- Total vertical range
- 314 m (−314 / +0)
- Length
- 36,600 m
- Massif · area
- Bihor Mountains · Răchițele, Cluj County
- Entrance
- 1,165 m altitude
- Discovery
- First systematic exploration in 1978 (CS Z Oradea); Politehnica Cluj since 1984.
- Other names
- Peștera Humpleu
- Teams
- CS Z Oradea · Politehnica Cluj
- Exploration
- Dormant in recent sources. Sustained historic exploration (Z Oradea since 1978, Politehnica Cluj since 1984); no campaigns announced in 2025–2026 in the sources consulted.
- Access
- Caving / technical access Class A: only CPS-authorised activities, with the administrator's approval. No public access.
- Protection
- Class A; mineralogical and paleoclimatic importance, cave bear.
Why it matters
- The country's second-longest system: 36,600 m.
- A depth of −314 m in a mostly horizontal system.
- Studied for minerals, paleoclimate and cave fauna.
Sources
- Speologie.org — Humpleu record (314 m; −314; 36,600 m; alt. 1,165 m; class A)
- Speomond 13; humpleu.ro (exploration history)
Last checked: 14 September 2026.
9 Zalion Cave
Zalion Cave runs down the same slope as Tăușoare, in the Telcișor basin: −298 m below the entrance and 5 m above, 4,513 m of passages. It belongs to the same Tăușoare–Zalion protected complex in the Rodnei Mountains.
- Total vertical range
- 303 m (−298 / +5)
- Length
- 4,513 m
- Massif · area
- Rodnei Mountains · Telciu, Bistrița-Năsăud County
- Entrance
- 830 m altitude
- Discovery
- Present in the Systematic Catalogue since 1981; research published in 1996.
- Exploration
- Dormant in recent sources. No campaigns announced in 2025–2026 in the sources consulted.
- Access
- Caving / technical access Caving access, with the custodian's/administrator's agreement and a CPS permit where required. No public access.
- Protection
- Tăușoare–Zalion protected complex; class not published in the record consulted.
Why it matters
- Tăușoare's slope neighbour, in the same basin.
- −298 m below the entrance, +5 m above — almost entirely negative.
- 4,513 m of passages in a cave little known to the public.
Sources
- Speologie.org — Zalion record (303 m; −298; +5; 4,513 m; alt. 830 m)
Last checked: 14 September 2026.
10 Rezervă Shaft
In 2018, Rezervă Shaft was a fissure down which a stone fell a few metres. Over 75 days of Politehnica Cluj digging followed, and in June 2026 the team broke the terminus and entered the main collector, at about −300 m — exactly the national top's threshold.
- Total vertical range
- 300 m (−300 / +0)
- Length
- 1,500 m Approximate; the new passage is estimated at ~800 m.
- Massif · area
- Bihor Mountains · Pietroasa, Bihor County
- Entrance
- 1,050 m altitude
- Discovery
- Discovered in 2018 as an impenetrable fissure with a strong draught.
- Teams
- Politehnica Cluj
- Exploration
- Active. The Păuleasa camp (25 May–1 June 2026): a 3-day bivouac, passing the terminus squeezes, the main collector explored at about −300 m. The new passage (~800 m estimated) still unsurveyed.
- Access
- Authorised research / exploration An active exploration dig: access for the exploration team only, with permits. No public access.
- Protection
- Apuseni Nature Park; class not published in the record consulted.
Why it matters
- From impenetrable fissure to −300 m in 8 years of digging.
- The freshest entry in the top 10.
- A possible link with Păuleasa Spring, so far unproven.
The length (~1,500 m) includes the estimated new passage, unsurveyed.
Sources
- Speologie.org — Rezervă record (300 m; −300; 1,500 m; alt. 1,050 m)
- Speologie.org — New explorations in Rezervă Shaft (3 June 2026): collector at −300 m, ~800 m passage
Last checked: 14 September 2026.
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