What remains is a rath, the Irish term for a ringfort, which was the most common form of rural settlement during the early medieval period, roughly from the fifth to the twelfth century. These were typically enclosed farmsteads, their earthen banks and ditches marking out a household's territory rather than serving any serious military purpose.

The site at Rahanagh measures twenty-nine metres in diameter, enclosed by an earthen bank that rises to about eighty centimetres on its inner face and a somewhat more substantial one point three metres on the outer side. Beyond the bank lies a fosse, the external ditch that would originally have reinforced the sense of enclosure; here it measures just under four metres wide and survives to a depth of around thirty centimetres. A field boundary, almost certainly of much later date, has been laid out to encircle the whole monument at a distance of roughly ten metres, following the outer edge of the fosse along its north-northeast to east-southeast arc. On the northwest to north-northeast side, however, the bank has been levelled across a width of about twelve metres, and the surrounding field boundary is correspondingly removed in the same area. The fosse along this stretch has been filled in with debris from that demolished boundary section. Whether this levelling was deliberate clearance or gradual agricultural erosion is not recorded, though it is the kind of modification that recurs across ringfort sites throughout the country. The record was compiled by Denis Power and uploaded in August 2011.

The interior, though level and dry, is almost entirely covered by mature trees and dense undergrowth described at the time of survey as effectively impenetrable. A small pool, about three metres across, sits in the northwest quadrant, likely connected to the low-lying disturbance in that part of the bank. For anyone approaching the site, the encircling field boundary and the tree cover make the underlying circular form easier to read from a slight distance than from within. The northwest gap in the field boundary corresponds to the levelled section of the bank, and that remains the most accessible point of entry, though the interior itself offers little in the way of clear views.