Castillo San Pedro de Alcántara

Castillo San Pedro de Alcántara sits on an island at the mouth of the Valdivia River and combines stone and wooden structures that once served as barracks, workshops, and storage rooms. The site was equipped with artillery and defensive towers to protect the colonial settlement from sea attacks.

The Spanish began construction in 1645 following a Dutch threat to the region and sent troops to secure the coast. This fortress became part of a defensive network that protected Spanish colonial interests along this strategic river entrance.

The fortress reflects how military defense and religious life were intertwined in colonial times. Walking through the complex, you can see how the chapel and fortifications functioned as parts of a single purpose.

The island is best accessed by boat from Corral in a short ride across the water. Visitors should prepare for changeable weather and uneven ground as they explore the fortification remains.

The thick stone walls reveal the craftsmanship of Spanish engineers who built sturdy structures suited to this coastal region's damp climate. The scale and construction style show how seriously the Spanish took defending this remote colonial outpost.

Location: Corral

GPS coordinates: -39.88944,-73.39444

Latest update: December 9, 2025 12:23