What survives at Carrowcrom is a roughly squarish area of about fifteen metres across, its western side defined by a low stone-faced scarp less than a metre high, its southern boundary an east-west field wall sitting atop a sod-covered bank. The whole thing is so thoroughly entangled in scrub that a proper inspection has proved difficult, and the original shape of the structure remains genuinely uncertain.

What makes the site quietly puzzling is that it does not appear at all on the Ordnance Survey six-inch map of 1838, one of the most detailed cartographic records of rural Ireland ever produced. By the time the 1922 edition was drawn, it had become visible as a subcircular area of roughly sixteen metres in diameter, marked by an arc of hachuring, the cartographer's shorthand for a sloping edge or bank, on the north-west side, with field boundaries defining it elsewhere. The enclosure may originally have been a circular or subcircular form, the kind commonly associated with early medieval settlement in Ireland, where a raised bank and ditch would enclose a farmstead or small community. Over time, however, it appears to have been substantially altered and folded into a later system of field walls, its curved geometry gradually straightened and squared off by more practical agricultural hands. The result is a structure that sits awkwardly between categories, neither fully ancient nor fully modern, its western scarp still curving faintly before surrendering to a straighter line heading north to east.

The enclosure occupies a rise in undulating pasture, with a stream running approximately ninety metres to the west, the kind of positioning that recurs across early Irish settlement sites, elevated enough for visibility and drainage, close enough to water for daily use. The blackthorn and gorse that now engulf it are not merely inconvenient; they are themselves a kind of evidence, suggesting the interior has been left largely undisturbed for long enough for dense scrub to take hold and hold firm.