description Furna do Enxofre (Graciosa) Overview
Furna do Enxofre is a basaltic lava cave inside the Caldeira da Graciosa Natural Monument on Graciosa Island in the Azores, Portugal. Its large vaulted chamber contains a cold underground lake about 11 metres deep and a fumarolic field with muddy water and gases released from the ground. The cave is part of the Azores Geopark and is visited through a visitor facility that explains the island's volcanic geology.
help Furna do Enxofre (Graciosa) FAQ
Where is Furna do Enxofre located?
Furna do Enxofre is inside the Caldeira da Graciosa Natural Monument on Graciosa Island in the Azores, Portugal. It is a basaltic volcanic cave with a large vaulted chamber.
How deep is the underground lake in Furna do Enxofre?
The cave contains a cold underground lake about 11 metres deep. The lake lies inside the large chamber formed by the basaltic volcanic system.
Is Furna do Enxofre a lava tube?
It is a basaltic lava cave formed in the volcanic interior of Graciosa Island. Its chamber also contains a fumarolic field, muddy water, and gases released from the ground.
Why is Furna do Enxofre associated with sulfur and volcanic gases?
The cave has a fumarolic field where gases and muddy water emerge from the volcanic ground. Those active-looking features help explain its association with sulfur and its name, which means Cave of Sulfur.
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