Fuerte de San Luis de Alba de Amargos, Spanish colonial fort in Corral, Chile.

Fuerte de San Luis de Alba de Amargos stands on the south shore of Corral Bay, near the town of Corral. It is a stone fortification with merlons, the walls on which the cannons rested, now much deteriorated. Its firepower was doubled to 12 cannons in 1679. From the site there is a panoramic view of the Niebla and Mancera fortifications.

Planned in 1645 by Viceroy Pedro Álvarez de Toledo y Leiva, Marquis of Mancera, with plans by engineer Juan de Buitrón y Mujica, the fort was built between 1655 and 1661, though some sources cite 1658 or 1677. Work began under governor Fernando de Bustamante y Villegas on orders of the Count of Alba de Liste and was finished by Diego de Marthos. Rebuilt in 1679, it doubled its firepower to 12 cannons.

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.

Entry to the fort has been closed since 2000 because the merlons, the walls supporting the cannons, carry a risk of collapse from the tide and wind. Visitors stay outside the walls, from where the fortifications of Niebla and Mancera can be seen across the bay.

The fort was rebuilt in 1679, doubling its firepower to 12 cannons. Since 2000 entry has been banned because the merlons, the walls supporting the cannons, risk collapsing under the swell and wind. From outside you can see the fortifications of Niebla and Mancera across the bay.