Gruta Casa de Pedra: Brazil’s towering cave portal
Gruta Casa de Pedra lies in PETAR (Alto Ribeira Tourist State Park), near Iporanga in São Paulo state. It is not near Tiradentes or São João del Rei. Its enormous entrance is a striking feature, but published height figures differ: the park lists 215 m, while a 2026 University of São Paulo lidar study measured 197 m.
Visitors may currently approach the portal only on the park’s monitored, advance-booked exterior trail. The state authority says entry into the cave is prohibited. A 2026 report from the University of São Paulo describes the cave as closed to visitors following a fatal 2003 flash flood and warns that water can rise rapidly. Do not enter the cave or river passage. The park’s listed trail takes about 2½–3 hours; check its current status and weather before setting out.
The following older photographs are included as cave illustrations; they do not show a route currently open to visitors.
UnusualPlaces Field Notes
- Location
- Casa de Pedra cave portal, PETAR Núcleo Casa de Pedra, Iporanga, São Paulo, Brazil (map pin marks the portal, not the visitor base). Published portal-height figures differ: the São Paulo park guide says 215 m; a 2026 USP lidar study measured 197 m.
- Coordinates
- -24.48169, -48.5915
- Access
- The São Paulo protected-areas authority lists the monitored 4–5 km Portal trail as a moderate exterior viewpoint walk; a guide is mandatory, advance booking is required, and cave entry is prohibited. Never enter the cave or river passage: rapid flooding has caused fatal accidents. The park guide lists capacity at 80 visitors/day. Check trail status and weather before setting out.
- Admission
- The state tariff table lists PETAR general admission at R$37/person, Brazil-discount at R$19, and Mercosur-discount at R$28; eligibility, half-price and exemptions vary. The Casa de Pedra unit page lists R$19 for Brazilian visitors, so the current official pages differ. Confirm your category, total price and whether monitoring is included in the booking portal or with the park before travel.
- Time needed
- The state-listed monitored Portal trail is 4–5 km and takes 2 h 30 min–3 h. This is the exterior approach and view only, not an interior-cave visit.
- Best season
- The park does not publish a preferred season. Rain can raise cave water rapidly and the 2026 USP study documents serious flash-flood risk. Before travel, check the park’s current trail status and weather; never enter the cave.
- Opening hours
- The state park lists the unit open Tuesday–Sunday, 08:00–17:00; the Portal trail departures are listed at 08:00 and 10:00 on those days. Advance booking and a monitor are required; daily trail capacity is 80. These hours describe the exterior trail only. Confirm current availability before travel.
- Location checked
- 2026-10-16
- Facts checked
- 2026-10-29
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