A slightly raised circular area, roughly twenty-two metres across, enclosed by a low bank of earth and stone that rises only thirty centimetres above the interior at its tallest point. No ditch, or fosse, is visible at ground level, and the original entrance has been worn away entirely. To an untrained eye, this could easily pass for a natural rise in the pasture.

The site is a rath, the most common type of early medieval ringfort found across Ireland, typically dating from roughly the sixth to the twelfth centuries. A rath was an enclosed farmstead, its earthen bank serving as a boundary marker and modest defensive barrier around a family's dwelling and outbuildings. At Tully, the bank is broadest where it is best preserved, reaching a width of 6.1 metres on the east to north-northeast arc, while the stretch running from north-northeast to east has been reduced to little more than a trace. Alongside the ringfort sits a small disused quarry, a roughly rectangular depression about seven metres long and up to eighty centimetres deep, which widens toward its southern end. Whether the quarrying disturbed the fort's northern perimeter or simply occupied ground nearby is not clear, but its presence adds a quiet industrial footnote to what is otherwise a pastoral scene.

The fort sits near the top of a gentle north-facing slope in elevated, undulating pasture, which would have made it a practical choice for early settlement: reasonable visibility, reasonable drainage. The bank's survival on the eastern side, while the northern arc has almost vanished, is a reminder of how incrementally these sites erode, season by season, under the weight of grazing animals and seasonal weather.