The ground underfoot tells a layered story: a substantially elevated interior, roughly 37 metres north to south and 40 metres east to west, ringed by a fosse in the form of a flat terrace, which is itself edged by a low outer scarp with traces of a stony rim that may once have been a proper bank. To the north-west, a natural hollow holds standing water, which the original builders may well have regarded as both a practical and symbolic feature of the site.

This is a rath, the Irish term for a ringfort, the most common monument type in the Irish countryside. Ringforts were typically enclosed farmsteads of the early medieval period, roughly between the fifth and twelfth centuries, used by farming families to protect livestock and mark out a household's territory. The Pollacappul example follows the form well: a defended platform, a surrounding ditch, and the suggestion of an entrance. A slump in the platform scarp on the east-northeast to east side, around six to seven metres wide, is likely where that original entrance once sat, the ground having settled and spread over centuries of disuse. Inside, the centre of the platform rises slightly, and along the eastern side of that central rise sits a small north-south row of three grass-covered stone heaps, each roughly one to one and a half metres across and only about twenty centimetres high. What they represent is unclear; they may be collapsed structural remains or accumulated field clearance, but their regularity is quietly suggestive.

The perimeter of the rath is lightly fringed with hawthorn bushes and three beech trees, a common enough sight around such sites, where tradition and the difficulty of ploughing circular banks have together helped preserve them. A field fence running east to west cuts across the southern edge of the outer terrace, the ordinary business of later farming pressing up against something considerably older.