The field looks ordinary enough, open pasture with a couple of mature deciduous trees standing in its north-western corner. But the land rises and then drops away with a deliberateness that grass and time cannot entirely conceal, and what you are standing on, or beside, is the surviving earthwork of a ringfort, a rath, the kind of enclosed farmstead that was the basic unit of rural life in early medieval Ireland.

A rath, to use the Irish term, was typically a roughly circular area of ground enclosed by one or more earthen banks and ditches, within which a farming family would have kept their dwelling and livestock. The example at Drommoher is semicircular in plan, measuring approximately 30.5 metres north to south and 19.5 metres east to west. Its defining feature is a scarped edge, meaning the ground has been cut and shaped into a steep face rather than built up into a conventional bank. That scarp runs from the north-north-west around to the south-south-east and reaches a height of 1.7 metres at its most pronounced, with a width of 7.4 metres. Towards the north-north-east and the south-south-east the earthwork diminishes considerably, dropping to 0.4 metres and 0.15 metres respectively. The interior is level. A field boundary once ran through the enclosure, bisecting it entirely, though it has since been removed and replaced by a wire fence. The western side of the monument shows no visible trace of any original enclosure, which may explain the semicircular rather than fully circular appearance. The survey was compiled by Denis Power and uploaded in August 2011.

The site sits in working pasture, so access depends on the landowner's goodwill and the usual courtesies of the Irish countryside. The earthwork reads best in low winter or early spring light, when vegetation is thin and the shadow cast by the scarp becomes easier to follow. The two trees in the north-western quadrant are a useful landmark when orientating yourself on approach. The southern and south-eastern sections of the scarp are the most reduced, so the stronger earthwork survives to the north and west, where the original cut into the hillside is still legible as a clear change of level underfoot.