The westernmost pinnacle of Lydstep Ledge at the western entrance to Caldy Sound, with a 3 fathom safe navigational clearance. Sailing Directions dating to 1884 note '.. Sound rock, also with a depth of 12 feet...'

Sources include:
Admiralty; 1884, Sailing Directions for the Bristol Channel, 4th Ed, pg76
Historic Admiralty Chart 1076-B8, RCAHMW Digital Collections sourced from the Uk Hydrographic Office and first published in June 1888

Maritime Officer, RCAHMW, April 2014.