Roughly thirteen metres across in both directions, it is defined by a scarp, essentially an artificial or enhanced slope cut into the earth, that rises to about eighty centimetres on the eastern side and climbs to a metre and a half on the west. The top of the platform is level, which is the detail that marks it out: this is not simply a natural rise in the ground, but something that was once deliberately shaped.

Enclosures of this kind are understood broadly as enclosed spaces defined by earthworks, and they appear across Ireland in a variety of forms and periods. What remains at Carrowcrin is modest but legible. The scarp merges to the north-northwest and northeast with a steeper natural fall of ground, suggesting that whoever shaped this feature worked with the existing topography rather than against it. At the southern base of the platform, the remains of a levelled field-boundary wall can still be traced, hinting at later agricultural activity that has since been largely erased. Around fifty metres to the east-southeast lies a rath, the kind of roughly circular earthwork enclosure most commonly associated with early medieval settlement in Ireland, which raises the possibility that these two features were once part of the same broader use of this corner of County Sligo, though no firm connection has been established.