The fortress was constructed by the Dutch West India Company in 1631 to protect the entrance to the Port of Recife.
Its strategic positioning on the cliffs allowed artillery to control passage through the channel between the fortress and the Santo Aleixo Island.
The masonry techniques used by the Dutch at this site differ from Portuguese colonial fortifications found elsewhere in Pernambuco.
The site was abandoned by the Dutch in 1654 following the capitulation of the West India Company to Portuguese forces.
Local geological formations surrounding the ruins consist of metamorphic rocks dating back to the Precambrian period.
The ruins are officially protected as a site of historical and cultural heritage within the state of Pernambuco.
The Sea Castle Fortress, locally known as Forte Castelo do Mar, is a historical ruin located at the strategic point of Cabo de Santo Agostinho in Pernambuco. It sits at the tip of the promontory, offering a panoramic view of the Atlantic Ocean and the southern coastline of the state. Constructed during the Dutch occupation of Brazil in the 17th century, it served as a critical defensive bastion to monitor maritime arrivals. The structure is composed primarily of stone and mortar, with walls partially preserved against coastal erosion. It is integrated into the Parque Metropolitano Armando de Holanda Cavalcanti, a protected environmental area. Visitors can walk through the remnants of the defensive walls and observation platforms. It remains a site of military archaeological interest due to its specific Dutch colonial design. The area is also known for its rugged geography, characterized by high cliffs that separate it from the nearby Gaibu and Calhetas beaches.
The highest point of the ruins looking out toward the horizon where the Atlantic Ocean meets the cliff line.
Wear sturdy hiking shoes, as the path to the ruins involves uneven terrain and loose gravel.
Bring sun protection and hydration, as there is minimal shade near the exposed cliff edges.
Visit during low tide if you plan to explore the coastal paths leading toward the base of the cliffs.
Do not attempt to access the cliff edges during high winds or rain, as the ground can become slippery and unstable.
Stay within marked paths to avoid cliff hazards; climbing on the unstable historical walls is strictly prohibited.
