This rugged area, measuring roughly 700 metres north to south and varying between 50 to 220 metres east to west, represents the island’s highest point, with cliffs rising dramatically from the Atlantic. The peninsulas are naturally defended by a narrow isthmus, barely 40 metres wide, which acts like a natural moat separating the southern section from the rest of the island.

Along the inner edge of this natural barrier stand the grass-covered remains of what appears to be a defensive wall, stretching about 40 metres in length and 2 metres wide, though now reduced to between half a metre and a metre in height. Several granite blocks can still be seen standing on edge along portions of the structure. Historical records suggest this area once housed a castle; the Civil Survey of 1654-56 mentions a ‘Little Castle’ here, whilst the antiquarian John O’Donovan, writing in 1835, described it as a modern square castle built of lime and stone.

Today, no visible traces of the castle itself remain, leaving archaeologists to puzzle over what relationship, if any, existed between the surviving stone wall and the vanished fortress. The Ordnance Survey maps still mark this spot as a castle site, preserving the memory of a structure that once commanded these spectacular sea cliffs. The archaeological survey that documented these remains in 1983 noted numerous other sites scattered across this windswept peninsula, testament to centuries of human occupation on this remote Atlantic outpost.