This unusual structure consists of an elliptical enclosure measuring 10.5 metres from east to west and 3.5 metres north to south, defined by a continuous ring of low standing stones, or orthostats, that rise between 20 and 50 centimetres from the ground. The interior space has a slightly domed appearance, and remarkably, there’s no visible entrance; the stones form an unbroken boundary that meets at pointed ends on both the eastern and western sides.

The monument’s distinctive boat like shape and east to west orientation make it stand out amongst Ireland’s prehistoric structures. Located at the western end of St. John’s Point, with a cairn situated 175 metres to the north northwest, this enclosure represents a rare architectural form that raises questions about its original purpose and the people who built it. The careful arrangement of stones, meeting precisely at points on either end, suggests deliberate planning and construction rather than a natural formation or field boundary.

Compiled by archaeologist Caimin O’Brien in May 2010, the documentation of this site adds to our understanding of the diverse range of prehistoric monuments found across the Irish landscape. Its position on poorly drained land might seem an unusual choice for such a structure, yet this very placement could hold clues to its function, whether ceremonial, burial related, or serving some other purpose lost to time.