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Caves and potholes of Lazio

The catalogue of Lazio lists 2,149 caves, including 438 potholes and 1,581 caves. The longest is Grotta degli Urli (3,516 m) and the deepest is Ouso di Passo Pratiglio (800 m).

2,149 caves
121.9 km total length
800m max depth

Length adds each cave once (a system counts once), and depth is that of the deepest cave, canyons excluded. Without length data: 389. Without depth data: 546. Without known lithology: 2,149.

The 20 longest

Full ranking: longest caves in Lazio

The 20 deepest

Full ranking: deepest caves and potholes in Lazio

Map

Provinces

Roma

768 caves
40.3 km
710m
🏆 Longest: Grotta del Formale (2,920m)
⬇️ Deepest: Ouso della Rava Bianca (710m)

Frosinone

613 caves
45.0 km
800m
🏆 Longest: Grotta degli Urli (3,516m)
⬇️ Deepest: Ouso di Passo Pratiglio (800m)

Latina

577 caves
22.7 km
401m
🏆 Longest: Grotta degli Ausi (1,505m)
⬇️ Deepest: Voragine del Vallaroce (401m)

Rieti

164 caves
10.9 km
450m
🏆 Longest: Pozzo della Sibilla (3,500m)
⬇️ Deepest: Pozzo della Sibilla (450m)

Viterbo

27 caves
3.0 km
25m
🏆 Longest: Il Bucone (1,250m)
⬇️ Deepest: Buca della Franciola (25m)

The figures of these places do not add up to the total: a cave can be in more than one place, or in none when its location has no lower level.