Furnas do Enxofre

Furnas do Enxofre is a geological monument on Terceira Island in the Azores, shaped by intense geothermal activity beneath the surface. The site displays steaming vents, boiling mud pools, and sulfurous deposits that reveal the island's active volcanic system.

The location formed through volcanic processes that have shaped Terceira Island over thousands of years. It was designated a natural monument in 2004 to protect its geological importance and make it accessible to the public.

The site reflects the volcanic identity of the Azores and shows how locals view geothermal features as part of their natural world. Visitors can see smoking fissures and hot springs that have shaped island life and the way people understand their landscape for generations.

Access is provided via marked walkways that allow safe viewing of the geothermal features. Wear sturdy shoes and be mindful of hot ground and sulfurous air that can irritate eyes and throat.

The fumaroles and mud pots form because of underground heat that boils nearby water and releases sulfurous steam. This rare system reveals how close volcanic activity lies to the surface and offers a direct glimpse into the Earth's inner processes.

Location: Azores

Inception: 2004

Address: Porto Judeu, 9700-000 Angra do Heroísmo, Portugal, 9700, Portugal

Website: https://parquesnaturais.azores.gov.pt/en/parques/8/areasprotegidas/89

GPS coordinates: 38.72972,-27.23201

Latest update: December 8, 2025 21:06