The caves are formed from Miocene limestone, which dates back approximately 5 to 23 million years.
A specialized microclimate exists within the protected alcoves, supporting unique coastal flora.
The name 'Algar Seco' translates literally to 'dry cave' or 'dry pit' in Portuguese.
The rock formations here are part of the broader 'Algar de Benagil' geological belt that defines the southern Portuguese coastline.
Algar Seco is a system of limestone cliffs and sea caves carved by coastal erosion located on the Atlantic shoreline of Carvoeiro. The site features a series of natural tunnels, rock arches, and saltwater pools accessible via stone staircases integrated into the rock face. It is characterized by its honeycombed karst landscape formed by the dissolution of soft rock by wind and wave action. Elevated walkways connect the various lookout points and subterranean grottoes. The area is part of the extensive Algarve cliff formation, showcasing geological patterns visible both from above and at sea level.
The 'A Boneca' cave window, which frames the Atlantic Ocean through a natural rock opening.
Wear footwear with high-traction soles as the limestone surfaces can be slippery even when dry.
Follow the designated wooden walkways to prevent erosion of the fragile cliff edges.
Bring a flashlight if you intend to explore the deeper, recessed parts of the grottos.
Do not attempt to swim in the interior pools if the sea is rough, as surge can create dangerous currents in confined spaces.
Use caution on uneven rock surfaces and maintain distance from the unprotected cliff edges.
