Castle Cornet
castle in
Saint Peter Port
#1 in Saint Peter Port
/
#1 in Guernsey
![](https://images.pineqone.com/Castle Cornet Guernsey 4.jpg)
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 the Guernsey's main harbour, St Peter Port's harbour.
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