Described as 'rocky prongs' stretching out southwesterly and northwesterly from Castle Point, Pen Cwningen being the north western extremity. Admiralty Sailing Directions suggest that they may be cleared by 'keeping all the farmhouse on the face of Clarach hill open to the northward of a conspicous sugar load rock, Carreg Fulfran, lying at the foor of Craig Lais'.

Sources include:
Admiralty, 1870, Sailing Directions for the West Coast of England from Milford Haven to the Mull of Galloway including the Isle of Man, pg40

Maritime Officer, RCAHMW, August 2014.