In form they are two submerged plateaux extending from the north-west to the south-east about 169 feet (52 m) apart and separated by a channel of 39–49 feet (12–15 m) depth. The north-west rock is approximately 66 feet (20 m) in diameter, and 16 feet (4.9 m) under water, while the south-east rock is 197 feet (60 m) in diameter and lies only 4 feet (1.2 m) under water.
- Smyth, William Henry (1854). The Mediterranean: A Memoir Physical, Historical, and Nautical. London: John W. Parker and Son. p. 457.
- Gilly, William Octavius Shakespeare; William Stephen Gilly (1850). Narratives of shipwrecks of the Royal navy between 1793 and 1849. London: John W. Parker. pp. 308–309.
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