This is a rath, the Irish term for a ringfort, a type of enclosed farmstead that was the most common form of rural settlement in early medieval Ireland, typically dating from roughly the fifth to the twelfth centuries. Thousands survive across the country in various states of preservation, yet each one retains its own particular character, and this example at Flean More is no exception.

The enclosure is very nearly circular, measuring 30.6 metres north to south and 29 metres east to west. It is defined by an earthen bank that stands 0.85 metres above the interior ground level and rises to 1.6 metres when measured from the outside, where a fosse, that is a defensive ditch, runs around the perimeter. The fosse here is 1.5 metres wide and 0.7 metres deep, modest but still clearly legible in the ground. Three rough breaks in the bank occur at the north, east, and south-southwest, at least one of which may mark an original entrance point, though disturbance over the centuries makes it difficult to be certain. The enclosing bank is heavily overgrown with trees and bushes, which both obscures the earthwork and, in a practical sense, helps protect it from agricultural erosion. The site was recorded and described by Denis Power, with notes compiled and uploaded in August 2011.

The interior is level and under rough pasture, with a cluster of hawthorn trees growing near the centre. Hawthorn has long been associated with ringforts in Irish folk tradition, often left uncut out of a mixture of respect and superstition, and their presence here gives the interior a slightly enclosed, self-contained atmosphere. The site sits within working farmland, so access would depend on landowner permission. The earthwork is most legible in low winter light or early morning, when raking shadows across the pasture bring the bank and fosse into sharper relief than they would appear in the flat light of a summer afternoon.