Colonial Forts at Niebla and Corral

The string of colonial forts at Niebla, Corral, and Mancera Island that guards the mouth of the Valdivia River is the best-preserved Spanish colonial fortification system on the Pacific coast of South America. The forts were built and repeatedly reinforced from the 17th century onwards, when the Spanish recognized the strategic importance of the river and the threat posed by Dutch, English, and pirate vessels. They are reached from Valdivia by boat — one of the most enjoyable river journeys in southern Chile.

The boat from Valdivia's waterfront takes about 90 minutes to reach the forts at Corral, stopping at Niebla (the most accessible fort, with the best-preserved cannons and ramparts) along the way. Mancera Island, in the middle of the estuary mouth, has the most isolated and atmospheric site, where the fort walls still carry their original bronze cannons. The landscape throughout the journey — the forested hills, the river widening toward the sea, the kelp forests at the river mouth — is beautiful. Return boats run throughout the day; the full excursion including time at the forts takes five to six hours.

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A story
The forts guarding the Valdivia estuary were considered the strongest Spanish fortifications on the Pacific coast of South America, and yet they fell in 1820 to Lord Cochrane's Chilean patriot navy in one of the most audacious naval operations of the independence wars. Cochrane — a British admiral who had been dismissed from the Royal Navy over a stock exchange scandal and had taken command of the Chilean navy — captured the forts by disguising his ships and sailing directly into the harbour at night. The defeat accelerated the collapse of Spanish power in Chile.