The surrounding tillage has eaten into the landscape for centuries, yet this circular enclosure has endured, its earthen bank still rising to around one and a half metres on the interior and its outer ditch, or fosse, surviving along the southeastern, southern, and southwestern arc. The interior remains grass-covered, a small untouched island amid worked ground.

The structure is a rath, the Irish term for an earthen ringfort, the commonest type of enclosed settlement from early medieval Ireland, broadly spanning the period from around 500 to 1000 AD. Typically a single farmstead, these enclosures defined a household's domestic and agricultural space, offering both a physical barrier and a statement of status. This example at Tullig measures roughly 33 metres north to south and 32 metres east to west, placing it in the middling range for such sites. It sits on a north-northwest-facing slope, and a gap of around five metres in the bank to the northeast likely marks the original entrance. The later field boundaries tell their own quiet story of continuity and encroachment: one fence runs concentrically to the bank on the west side, following its curve, while another abuts the outer bank face to the north. What is also notable is that a second ringfort lies approximately a hundred metres to the west in an adjoining field, a reminder that these sites were rarely as isolated as they might appear today; early medieval communities were often denser on the ground than the modern countryside suggests.