This rectangular earthwork platform, measuring 35 metres long by 31 metres wide, represents a type of defensive settlement that was particularly common in medieval Ireland. The site consists of two earthen banks with a water-filled ditch, or fosse, running between them; a classic design that would have provided both defence and drainage for whatever structures once stood within.

The monument has seen better days, though it remains in fair condition despite some damage from stone quarrying at its southwestern corner and a modern drain that cuts along the western side. Originally, the defensive ditch was kept filled by a clever bit of medieval engineering: a stream was diverted to run along the southern edge of the site, feeding water into the fosse before the flow continues to a natural sink-hole at the southeast corner. This water management system would have ensured the moat remained an effective barrier year-round.

While no trace of the original entrance survives, these moated sites typically housed timber-framed buildings and were often associated with Anglo-Norman settlers or Gaelicised lords during the 13th and 14th centuries. They served as fortified farmsteads or minor manor houses, offering protection in uncertain times whilst managing the surrounding agricultural lands. The Fahy site, also known locally as Páirc An Mhuilinn, stands as one of many such earthworks scattered across the Irish countryside, each one a reminder of how medieval communities balanced the needs of defence, agriculture, and daily life.