Caverna do Diabo: São Paulo's Largest Cave

Caverna do Diabo sits 280 km southwest of São Paulo city in Eldorado, at the end of a paved road that climbs out of the Ribeira Valley into protected Atlantic Forest. Around 600 of its roughly 6,000 mapped metres are open to the public, and you cannot walk them alone — a local guide from the surrounding quilombola communities leads every group.

Inside, the air holds steady at around 20°C year-round, which makes the cave a sensible stop even on a wet February afternoon. Walkways and low lighting carry you through cathedral-sized chambers past stalactites, columns, travertine curtains and helictites that bend sideways against gravity. Almost every Brazilian report calls it the country's eighth wonder. That label is generous, but the scale of the main halls is not exaggerated.

Getting There and Getting In

The cave's official name is Gruta da Tapagem. Caverna do Diabo is the nickname that stuck, and locals use both interchangeably. The cave forms the centrepiece of Parque Estadual Caverna do Diabo, a 40,000-hectare state park created in 2008 that also protects trails, waterfalls and a chunk of the Jacupiranga conservation mosaic.

Driving from São Paulo

Take the BR-116 (Rodovia Régis Bittencourt) south toward Curitiba and leave it at Eldorado. From there the SP-165 runs about 40 km to the park entrance at Km 111. Budget three and a half to four hours each way in normal traffic; the last stretch is fully paved now, though the bends warrant caution after heavy rain. Driving yourself gives you the freedom to stop at the Cachoeira do Meu Deus waterfall on the road in — it needs its own guide, arranged separately.

Guided day trips and buses

Organised tours from São Paulo typically leave late at night, reach the cave in the morning and return the same evening, priced from around R$ 250–300 per person without meals. Public buses to Eldorado exist but drop you in town, 43 km from the cave gate — an impractical gap without your own vehicle. If you have no car, the day-trip option is the realistic one.

Tickets, hours and guides

Entry costs R$ 19 per person; students pay R$ 9.50, and children under 12 and visitors over 60 enter free. That fee covers the park, not the cave tour. The standard guided cave walk adds roughly R$ 30 per person, and guides are mandatory. The park opens Tuesday to Sunday, 8:00–17:00, with Monday openings during school holidays and long weekends. No advance booking is needed for the standard tour — you register and pay at the gate. Adventure routes are different: they require advance reservation and cost considerably more. Fees change, so confirm current rates on the official park site before you travel.

Inside the Cave: The Standard Walk

The classic tour covers 1.2 km of walkway in about an hour, moving in groups capped at 12 people. Nothing about it is strenuous. There are stairs, handrails and electric light throughout, and children from about age five handle it without complaint. The payoff is the scale: ceilings that vanish into darkness, a chamber called the Cathedral, and a rock formation that really does resemble a skull, lit red at the eye sockets — the reason for the cave's name.

Adventure routes for the restless

Three wilder options run beyond the lit path, all with guides and helmets. The Salão dos Ossos route adds two rappels of 40 m and 10 m and covers around 1.8 km without entering water. The Garganta do Diabo route wades straight into the underground river toward an internal waterfall with a 5 m drop — expect wet feet and some scrambling. Erectus squeezes through narrow passages and smooth, exposed rock instead. Book any of these days ahead rather than on arrival; they sell out in holiday periods and each has age and fitness limits.

Above ground

Two short trails are included in the park entry fee. The Trilha do Araçá leads to a waterfall and swimming spot, and the Mirante do Govervo lookout gives a wide view over the forest canopy. Each takes one to two hours at an easy pace. Add them to the cave hour and you have a full half day on site.

Practical Tips for the Visit

Wear closed shoes with grip — the walkway stays damp and slick near the river section. Light trousers or jeans work better than shorts; some operators enforce this, and it keeps mosquitoes off your legs. Bring a light jacket, water, insect repellent and a torch if you plan an adventure route. Flash photography is prohibited inside the cave, and touching formations is both forbidden and damaging — the oils on your hands stop calcite from growing.

The driest months, roughly April through October, give the most reliable road conditions and the clearest forest views. That said, the cave itself is weatherproof, and a rainy visit means fewer crowds and fuller waterfalls in the park. Skip the trip entirely if you suffer from serious claustrophobia, use a wheelchair (the stairs rule it out), or are pregnant and considering an adventure route. For the standard walk, mobility is not an issue beyond the staircases.

Allow four hours minimum for the round trip from Eldorado town, and a full day if you are starting from São Paulo. Combine the cave with the Cachoeira do Meu Deus and the PETAR cave system near Iporanga only if you have two days to spare — the drives between them eat hours.

Frequently Asked Questions

Do I need to book Caverna do Diabo in advance?

No for the standard guided walk — you pay the R$ 19 park entry and roughly R$ 30 guide fee at the gate on arrival. Yes for the rappel and river routes (Salão dos Ossos, Garganta do Diabo, Erectus), which need advance reservation and have limited daily slots.

How long does the cave visit take?

The guided walk covers 1.2 km in about one hour, and groups are capped at 12 people. Add 20 minutes of typical waiting time at the entrance, plus one to two hours if you also walk the Araçá trail or the governor's lookout.

Is Caverna do Diabo suitable for children and older visitors?

The main walkway has handrails and lighting and works for most ages, including children around five and up. Stairs make it inaccessible for wheelchairs, and the adventure routes have minimum ages and fitness requirements set by the operators.

What should I wear inside the cave?

Closed, grippy shoes and light trousers. The path is damp near the river, shorts are sometimes refused at the entrance, and the interior holds around 20°C, so a thin jacket helps if you feel the cold.