Fuerte de San Luis de Alba de Amargos

Fuerte de San Luis de Alba de Amargos sits at the mouth of the Valdivia River and is built entirely of stone with eleven artillery pieces positioned to guard the harbor entrance. The fort has thick walls designed to withstand naval bombardment.

Construction began in 1655 under engineer Juan de Buitrón y Mujica on orders from the Viceroy of Peru and was completed in 1661. Brick structures were added in the 18th century to expand the original fortification.

This fort was part of a vast Spanish defensive network protecting settlements along the southern Pacific coast from seaborne attacks. Visitors can still sense the strategic importance this location held during the colonial period.

You can reach the site via the paved T-450 road from Valdivia to Corral, or by boat from Niebla. Sturdy footwear is recommended since the uneven stone surfaces can be slippery, especially in wet weather.

The original fort featured a drawbridge spanning a protective moat that surrounded the defenses. Inside the walls were military barracks, a commander's residence, a chapel, and later sections built with brick.

Location: Corral

GPS coordinates: -39.87332,-73.42379

Latest update: December 9, 2025 20:24