A volcanic cave inside the Caldeira da Graciosa, reached by a spiral staircase that descends around 90 meters to a chamber holding a small sulfurous lake. The cave takes its name from the sulfur deposits along its walls, and it is one of the defining natural sites of Graciosa Island.
Furna do Enxofre is a volcanic cave inside the Caldeira da Graciosa, reached by a spiral staircase that descends around 90 meters underground to a chamber holding a small sulfurous lake. The cave takes its name from sulfur deposits visible along parts of its walls, a reminder of the geothermal activity still present beneath Graciosa Island, and it ranks as one of the archipelago's most distinctive natural sites for combining a cave descent with genuine volcanic and geothermal features in one chamber. The visit itself, descending the stairway, viewing the lake, and returning, takes about 45 minutes. Because the site draws a steady stream of both independent travelers and organized tours, arriving during the early part of the daily opening window tends to mean a quieter descent with less waiting on the stairway. Hours are seasonal, so checking the current schedule before visiting Graciosa, a smaller and less-visited island reached by ferry or short flight, is worthwhile.
| Admission | Adult Approx €6 (approx $6.50) · Child Reduced rate, verify current pricing locally |
|---|---|
| Hours | Daily, approx 10AM-5:30PM, seasonal |
| Typical visit | 45 minutes |
| Best time | Early opening hours to avoid the busiest midday visits |
| Getting there | Rental car, about 10 minutes from Santa Cruz da Graciosa |
| Address | Caldeira da Graciosa, 9880 Santa Cruz da Graciosa, Graciosa, Azores, Portugal |
Location
Caldeira da Graciosa, 9880 Santa Cruz da Graciosa, Graciosa, Azores, Portugal
39.0206, -28.0158 View on map
Highlights
- Spiral staircase descending roughly 90 meters into a volcanic chamber
- Small sulfurous lake at the cave floor
- Sulfur deposits along the cave walls from ongoing geothermal activity
- One of Graciosa Island's defining natural sites
Tips for visiting
- Visit early in the opening hours to avoid the busiest midday visits
- Wear non-slip shoes for the spiral staircase, which can be damp
- Confirm seasonal opening hours before planning the trip to Graciosa
- Bring a light jacket, since underground temperatures are cooler
When to visit
Early opening hours to avoid the busiest midday visits.
Accessibility
The cave is reached by a spiral staircase with no elevator, making it inaccessible to wheelchairs and difficult for visitors with limited mobility.
Frequently asked questions
How long does a visit take?
A full visit, including the descent and return, takes about 45 minutes.
Is it worth it for kids?
Yes for children comfortable with a long staircase descent; supervision is recommended near the lake.
Is photography allowed?
Yes, photography is allowed, though the chamber's low light makes a steady hand useful.