A low earthen bank tracing a circle thirty-six metres across is not the most dramatic thing in the Irish landscape, but this ringfort at Barnhill earns a second look from its position alone. It sits near the southern end of a low plateau in tillage ground, and from there it looks out over the Barrow valley to the south-west, a vantage that would have made it quietly commanding in the early medieval period when such enclosures were in use.

Ringforts, known variously as raths or lios depending on local tradition, were the most common form of rural settlement in early medieval Ireland, typically enclosing a farmstead and its inhabitants within a bank and an outer ditch called a fosse. At Barnhill, the bank survives as a readable circuit, but the fosse has largely disappeared from view. That was not always the case. When Danaher recorded the site in 1955, traces of the fosse were still visible, suggesting that decades of tillage have since smoothed away what little remained of the outer earthwork. The bank itself endures, though low, holding its circular form against the steady attrition of agricultural land use around it.