Castle Cornet is a large island castle in Guernsey, and former tidal island, also known as Cornet Rock or Castle Rock. Its importance was as a defence not only of the island, but of the roadstead. In 1859 it became part of one of the breakwaters of Guernsey's main harbour, St Peter Port harbour.
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Official Website http://www.museums.gov.gg/article/101089/Castle-Cornet
Address United Kingdom
Coordinates 49°27'11.38" N -2°31'35.24" E