A promontory fort occupying a narrow headland south east of the Knave. The cliff has eroded considerably since the fort’s construction, but apparently the original entrance is discernable as a break in the defences, 5 metres short of the cliff edge on the south side (my source here is Prehistoric Sites of The Gower & West Glamorgan by Wendy Hughes).
The site is accessible from the coastal footpath, but be careful near the cliff edge!