description Furnas do Cavalum Overview
Furnas do Cavalum is a significant lava tube complex located on the Portuguese island of Madeira, specifically within the municipality of Machico. The site consists of an extensive underground network of tunnels and passages formed by ancient basaltic lava flows. During the volcanic eruptions, the surface lava cooled while the hotter interior continued to flow, eventually leaving these hollow geological structures behind. The complex remains an important natural feature for understanding the volcanic history of the Madeira archipelago.
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Where are Furnas do Cavalum located?
Furnas do Cavalum is a lava-tube complex on Madeira, a Portuguese island. The site is specifically located in the municipality of Machico.
How did Furnas do Cavalum form?
The tunnels formed from ancient basaltic lava flows. As the outer lava cooled and hardened, hotter material continued moving through the interior, leaving underground passages behind.
What can visitors find inside Furnas do Cavalum?
The complex contains an underground network of tunnels and passages created by volcanic activity. Conditions can be dark, uneven, and confined, so access depends on the route and local safety guidance.
Why is Furnas do Cavalum geologically important?
It preserves evidence of Madeira's volcanic past in the form of a substantial lava-tube system. The site shows how basaltic eruptions can create hollow channels beneath a cooling flow.
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