Caves around Serra De Santo António are a prominent feature of the landscape, located within the municipality of Alcanena in the district of Santarém. This region is characterized by its limestone geology, forming part of the Serras de Aire e Candeeiros Nature Park. The area is known for its extensive natural cave systems, offering insights into geological formations developed over millions of years. These underground environments provide a glimpse into ancient geological processes and unique ecosystems.
Last updated: June 30, 2026
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Definitely worth a visit. We visited another grotto during our stay, but this one was considerably larger and more impressive.
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Algar da Cerejeira is a remarkable geological karst formation, that is, a natural cavity or vertical sinkhole. These algars are typically formed in limestone regions due to the erosive action of water, which dissolves the rock and creates underground pits or caves. Algar da Cerejeira is therefore an example of this process, offering a fascinating glimpse into the depths of the earth.
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The Fórnea stream originates here, in the Cova da Velha cave, where a natural spring flows almost all year round. However, due to the limestone soil, the water easily infiltrates, traveling through underground galleries instead of flowing freely on the surface. As a result, the stunning Fórnea waterfall only reveals its full grandeur after days of heavy rain.
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While this was my second visit, I've enjoyed it as much as the first one! The first gallery of this system of caves was discovered by locals in 1947. Of course people were curious and had to investigate further. What is known today is that the cave reaches 11 Kilometers in length which makes it the biggest and most important in Portugal. The formation of the cave goes back 150 million years to the middle Jurassic age when dinosaurs inhabited this region. They found traces of species who inhabited these caves, some of it on display. A part of the cave-system was opened to the public in 1974 with many improvements in safety for the visitors in later years. At one point colored lights found their way in with some spectacular and dramatic effects. My photos inside the cave are in the wrong order, not sure how to interchange them or what I've done wrong when uploading, sorry!
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The most prominent cave directly within the Serra de Santo António is Grutas de Santo António, known for its impressive speleothems and well-lit passages. The wider region, part of the Serras de Aire e Candeeiros Natural Park, also features Grutas de Mira de Aire, one of Portugal's largest public caves, and Cova da Velha, where the Fórnea stream originates.
Yes, Grutas de Mira de Aire is particularly noted as family-friendly, offering a smooth, guided experience through grand chambers. Grutas de Santo António is also suitable for families, with well-maintained paths and knowledgeable guides.
The caves in this limestone region are famous for their spectacular speleothems, including diverse stalactites and stalagmites. In Grutas de Santo António, you can observe formations resembling jellyfish, brains, and even a 'column' formed by the union of a stalactite and stalagmite. Algar da Cerejeira is a remarkable geological karst formation, a vertical sinkhole created by the erosive action of water.
The internal temperature of caves like Grutas de Santo António remains a pleasant 16-18 °C (61-64 °F) year-round. This makes them an excellent destination regardless of the season, offering a cool escape in summer and a mild environment in winter.
For Grutas de Santo António, the walkable route is 293 meters, and guided tours typically last around 45 minutes to an hour. Grutas de Mira de Aire also offers a guided experience, with the duration depending on the specific tour, but generally allowing ample time to appreciate its grand chambers.
Given the consistent cool temperatures inside the caves (around 16-18 °C), it's advisable to wear comfortable walking shoes and bring a light jacket or sweater, even if it's warm outside. The paths are generally well-maintained, but good footwear is always recommended for exploring.
Yes, Grutas de Santo António has a new Visitors' Centre at its entrance, which includes amenities such as a restaurant, snack bar, and gift shop. Grutas de Mira de Aire also provides visitor facilities.
The Serra de Santo António region, part of the Serras de Aire e Candeeiros Natural Park, offers various outdoor activities. You can find easy hikes like the Fórnea Waterfall loop or the Cova da Velha loop. For mountain biking, there are moderate to difficult trails such as the Loop tour from Charneca. Running enthusiasts can explore routes like the Cabeça Gorda Viewpoint loop. You can find more details on these activities in the easy hikes, MTB trails, and running trails guides for Serra de Santo António.
Yes, the main caves like Grutas de Santo António and Grutas de Mira de Aire have dedicated parking facilities for visitors, making them easily accessible by car.
Yes, it is common for visitors to combine a trip to Grutas de Santo António with other caves in the wider Serras de Aire e Candeeiros Natural Park, such as Grutas de Mira de Aire. Some caves, like Grutas de Alvados, are even offered in combo tickets, providing a comprehensive underground exploration experience.
Grutas de Santo António offers a breathtaking journey into nature's artistry, showcasing incredible geological formations formed over millions of years. Its intimate feel, combined with well-lit paths and knowledgeable guides, creates an engaging and memorable experience. Visitors often highlight its impressive size and the 'magical' ambiance created by the illumination.


Extend your search for the best caves by checking out these guides of the top ones around Serra De Santo António: