Umajalanta Cave: Bolivia's Deepest Underground River

Umajalanta Cave, the deepest and longest cave in Bolivia, extends 4,600 meters in length and drops 164 meters below its entrance, carved by an underground river that vanishes into limestone in Torotoro National Park. The cave sits at about 2,800 meters above sea level in the northern Potosí department, roughly 13 kilometers from the village of Torotoro and about a 20-minute drive plus a 10-minute walk from town. Inside, the temperature holds steady near 9.5°C, a sharp contrast to the Andean sun outside, so bring a warm layer even on a clear day. The name comes from Aymara: uma means water, and jala means to disappear — referring to the Río Umajalanta, which vanishes beneath a limestone cap roughly 22 meters thick and reappears downstream.

What You'll See Inside Umajalanta Cave

The cave is a classic karst system formed in Cretaceous limestone, and the water that carved it still runs through the lower levels. You'll hear the river before you see it — a steady roar that echoes through the chambers. Formations range from slender soda straws to thick columns where stalactites and stalagmites have met, and underground waterfalls drop through gaps in the rock during the wet season.

The Blind Fish and the Vampire Bats

A resident population of blind catfish (Trichomycterus chaberti) swims in the cave's underground pools, their eyes reduced to tiny dots under the skin — a species found only in this system. Vampire bats roost in the upper galleries, and their guano has accumulated over centuries into a thick, steaming pile that supports a whole ecosystem of invertebrates. The smell is part of the experience. Guides usually point out the guano mound before you reach the lake, so you know what's coming.

Dinosaur Footprints on the Approach

The walk from the ticket office to the cave entrance passes several dinosaur footprints pressed into the rock, a preview of the park's larger track sites. These are not the main attraction — Carreras Pampa, closer to the village, has over 300 documented prints — but they add ten minutes of paleontology to the cave visit. The path itself is dusty and exposed, with no shade, so a hat and sunscreen matter more than you'd expect at 2,800 meters.

Planning Your Visit to Umajalanta Cave

Entry to the cave requires a licensed local guide, and helmets with headlamps are mandatory — you can rent both at the cave's control station or arrange them through the guide association in Torotoro village. The route inside is 350 to 500 meters, depending on water levels and the guide's judgment, and takes about two to three hours round trip from the entrance. It's not a boardwalk. Expect to crawl through narrow passages, slide down natural rock chutes on your backside, and use ropes for a couple of short descents. Wear long pants and shoes with grippy soles; you will get wet and dirty.

Tickets, Costs, and Guides

Park entry costs about BOB 30 for foreign visitors and BOB 20 for Bolivians, and the guide fee is separate, typically BOB 100 to BOB 350 depending on group size and whether transport is included. Groups are capped at six people for most tours, so solo travelers often wait to join others and split the cost. The guide association in Torotoro village arranges assignments; you can also book a full-day tour from Cochabamba for around BOB 830, which covers transport, equipment, guide, and entry. Fees change — check with the association or your tour operator for current rates.

Best Time to Go

April through October is the dry season, when trails are firmer and the underground river runs lower. The cave is visitable year-round, but January and February bring heavy rain that can raise water levels and close sections of the route. Even in the dry months, the cave floor stays slick near the lake, and the temperature inside hovers near 9.5°C — bring a fleece. Mornings are less crowded; tour groups from Cochabamba typically arrive around midday, so an early start gives you the cave with fewer headlamps bobbing ahead of you.

Who Should Skip It

The route is moderately physical and not suitable for claustrophobes, people with limited mobility, or anyone uncomfortable crawling through tight spaces. The cave is also not recommended for young children who can't follow safety instructions in Spanish — guides operate in Spanish only, and English translations are rare. If you want a cave experience without the crawling, the nearby Chiflón Qaqa cave offers a shorter, easier walk-through.

Frequently Asked Questions

How long does the Umajalanta Cave tour take?

Plan on two to three hours inside, plus 30 to 40 minutes of travel from Torotoro village. Full-day tours from Cochabamba run about 14 hours, including transport and other stops.

Do I need to book a guide in advance for Umajalanta Cave?

Bookings are made through the Torotoro guide association, either in person the day before or via phone at +591 743 59152. Groups are limited to six, and solo travelers can join a group to share costs.

Is the cave safe for someone with mild claustrophobia?

The route includes narrow crawls and enclosed chambers, and guides cannot shorten the route mid-way. If tight spaces trigger anxiety, the Chiflón Qaqa cave or the El Vergel canyon walk are better alternatives.

What should I bring to Umajalanta Cave?

Long pants, grippy shoes, a warm layer, and a change of clothes for the drive back. Helmets and headlamps are rented on site or provided by the guide. Lockers at the control station hold backpacks and valuables.