Caves around Alcanena are situated within the Parque Natural das Serras de Aire e Candeeiros in Portugal, a region known for its significant karst formations. This area offers a glimpse into subterranean worlds with diverse geological features. The landscape is characterized by limestone, which has led to the creation of numerous caves and underground chambers. Visitors can explore these natural monuments, which are a key part of the natural heritage of Portugal.
Last updated: May 9, 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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Beyond the natural structure of the cave, you can also visit the Scientific-Environmental Interpretation Centre (CICA gm). Here, visitors can discover how a cave is formed and how it interacts with local biodiversity, understand the importance of limestone in our region and how it influences people's way of life. You can also admire a magnificent and unique exhibition of minerals and fossils from Portugal and many other countries. In our shop you will find a huge variety of minerals and fossils from various countries.
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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 region is rich in karst formations. For instance, Cova da Velha is notable as the origin of the Fórnea stream, which reveals a stunning waterfall after heavy rains. The Grutas de Alvados, located in Alcanena, are celebrated for their intricate geological formations, including brightly decorated chambers, subterranean lakes, and gigantic columns. Additionally, Algar da Cerejeira is a remarkable vertical sinkhole, showcasing the erosive action of water on limestone.
Yes, the Lapa da Canada (Gruta da Lapa da Canada), near the source of the Alviela River in Alcanena, is ecologically significant. It serves as a crucial maternity roost for approximately 5,000 bats from April to September, including 12 different species, with nine being endangered. The Centro de Ciência Viva do Alviela organizes special 'Bat Nights' for observing these creatures.
Grutas de Mira de Aire is a highly recommended family-friendly cave. It's known as the largest accessible cave system in Portugal, offering guided tours through about 600 meters of its extensive galleries, showcasing impressive speleothems. Another option is Moeda Caves, which features a Scientific-Environmental Interpretation Centre (CICA gm) where visitors can learn about cave formation and local biodiversity, making it an educational experience for all ages.
Beyond exploring the caves, the region offers various outdoor activities. You can find numerous cycling routes, including Cycling around Alcanena, Road Cycling Routes around Alcanena, and MTB Trails around Alcanena. These guides feature routes of varying difficulties, allowing you to explore the natural park and its surroundings by bike.
The Gruta do Algar do Pena, situated within the Parque Natural das Serras de Aire e Candeeiros in Alcanena, holds the distinction of being the largest underground chamber in Portugal. It reaches depths of around 50 meters and features a spectacular display of diverse and unusual speleothems.
The caves maintain a relatively constant temperature year-round, making them a good destination in any season. However, for observing bats at Lapa da Canada, the period from April to September is ideal as it serves as a crucial maternity roost during these months. For exploring the surrounding natural park, spring and autumn offer pleasant weather for outdoor activities.
Yes, Moeda Caves features a Scientific-Environmental Interpretation Centre (CICA gm). Here, visitors can learn about cave formation, how it interacts with local biodiversity, and the importance of limestone in the region. It also hosts an exhibition of minerals and fossils.
Caves typically have a cool and constant temperature, often around 16-18°C (60-65°F), regardless of the outside weather. It's advisable to wear comfortable walking shoes with good grip, as paths can be damp or uneven, and bring a light jacket or sweater, even on a warm day.
While most accessible caves offer guided tours on well-maintained paths, some natural formations like Algar da Cerejeira are classified as challenging due to their nature as vertical sinkholes. These are typically explored by experienced cavers. For general visitors, the extensive network of Grutas de Mira de Aire offers a substantial exploration experience without requiring specialized caving skills.
Visitors frequently appreciate the stunning natural beauty and the impressive scale of the underground formations. The intricate speleothems, subterranean lakes, and the sheer size of chambers like Gruta do Algar do Pena leave a lasting impression. The educational aspects, such as those at Moeda Caves, and the unique wildlife viewing opportunities at Lapa da Canada, are also highly valued.
Yes, the Grutas de Mira de Aire, though a short distance from Alcanena, are widely recognized as the largest accessible cave system in Portugal and are considered one of the country's '7 Natural Wonders.' They feature an impressive array of speleothems and are a popular day trip destination due to their scale and beauty.


Extend your search for the best caves by checking out these guides of the top ones around Alcanena: