The volcanic origins of the Azores are evident in its 1,766 volcanoes, nine of which remain quietly active. Beneath the surface, there are nearly 300 known volcanic cavities, including caves, pits, and fissures. Across the archipelago’s landscape, you’ll find dry calderas, crater lakes, fumaroles, and hot springs. On Terceira Island, the traces of volcanic activity take on spectacular forms that are easy to visit. Explore incredible natural wonders such as Algar do Carvão, Furnas do Enxofre, and Gruta do Natal.
Algar do Carvão
Hidden in Terceira’s underground world lies a breathtaking natural marvel: the Algar do Carvão, a striking reminder of the island’s volcanic past. Once a lava channel, this majestic cave now captivates visitors with its vast interior. Its most impressive features are the silica stalactites hanging from the domed ceiling — among the largest known anywhere in the world. As a highly sought-after site and a protected natural reserve, Algar do Carvão operates with limited visiting hours. To fully appreciate its dramatic beauty, it’s important to plan ahead and make this wonder a priority in your Terceira Island itinerary.
Gruta do Natal
Venturing into Gruta do Natal, you’re met with an intriguing world shaped by powerful natural forces. Inside, you’ll find a variety of volcanic rock formations, including lava stalactites and stalagmites, as well as surfaces sculpted by Pahoehoe lava flows. The tunnel-like structure extends for a considerable distance, offering a fascinating glimpse into Terceira Island’s underground landscape. Well-maintained pathways and lighting systems ensure a safe and enriching exploration of this subterranean gem.
Furnas do Enxofre
Above ground, the Furnas do Enxofre are a vivid testament to the strength of Azorean volcanism. The landscape is marked by steaming fumaroles surrounded by lush moss and vegetation. The air is warm and carries a very distinctive scent… sulfur.
- * Photo by Diego Delso, CC BY-SA 4.0, Link