Located at the southeast corner of Bermuda, the Castle Harbour Islands Nature Reserve contains all of the islands and islets lying across the mouth of Castle Harbour between Tuckers Town and Cooper's Island. This includes Nonsuch Island, Southampton Island, Charles Island, Castle Island and a number of smaller rocks and islets. The Castle Harbour Islands contain many of Bermuda's critically endangered endemic species such as the Bermuda skink and cahow (Bermuda petrel). The Castle Harbour Islands have also been recognized by BirdLife International as an Important Bird Area (IBA) for the Caribbean. For these reasons, public access to the islands is strictly controlled.

The Castle Harbour Islands also contain important historical sites. These include Southampton Fort on Southampton Island and three fortifications (Devonshire Redoubt, the King's Castle and Landward Fort) on Castle Island. The single most important shipwreck in Castle Harbour is that of the Warwick almost 400 years ago (see the Warwick expedition). Castle Harbour as well as the Nonsuch buoy site are Bermuda Protected Areas.


Castle Harbour: 32°20'24.97"N, 64°40'29.28"W   Nonsuch Buoy: 32°20'48.01"N, 64°40'1.56"W    Maximum Depth: 45 feet (13.7 meters)