Frederick Reefs
Australia
Frederick Reef is in the Coral Sea Islands, over 220 nautical miles (410 km) northeast of Gladstone, Queensland. The reef was named in 1812 by Captain Joseph Savigny of Frederick, who first reported sighting the reef. Frederick Reef is a small atoll with a large rock called Ridge Rock at the southern end, a sand cay called Observatory Cay, and a lighthouse at the northern end, which is the only permanently dry land, although there are a few other cays that can be awash at high tide. The reefs are in a "J" shape that forms a semi-enclosed lagoon known as Anchorage Sound, with an opening on the North side. The complex measures about 10 by 4 kilometres (6.2 by 2.5 mi), with an area of 30 square kilometres (12 mi2). The reef is located in some deep water and drops sharply to over 2,500 metres (8,200 ft) on the western side.
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