The interior is heavily overgrown with bushes, and the bank that defines the site has been planted with deciduous trees, so the structure now wears its age in layers, part archaeology, part woodland succession.

This is a rath, the most common type of monument in the Irish landscape. Raths are ringforts built from earth and sod rather than stone, typically constructed during the early medieval period as enclosed farmsteads for single families or small communities. The one at Mountcorbitt is circular, with a diameter of around 22 metres, which puts it at the smaller end of the scale. The earthen bank stands about 1.3 metres high on the interior and 0.9 metres on the exterior, and it is fronted by a fosse, an external ditch, reaching a maximum depth of one metre. The entrance gap, just 0.8 metres wide, faces east, an orientation that appears with notable regularity across Irish ringforts. Whether this reflects practical concerns about prevailing weather or something more ritual in nature has never been definitively settled. The fort sits in pasture in a field to the north-north-east of the house at Mount Corbitt, which means it has survived within a managed landscape rather than being lost to intensive tillage.