The feature carries the classification of an inland promontory fort, a label that refers to a defended enclosure using natural topography, in this case the narrowing of a peninsula, as part of its barrier. But the earthwork here may not be prehistoric at all, and the question of what it actually defended, and for whom, is more interesting than its formal category suggests.

The bank and fosse, a fosse being a defensive ditch, together run approximately 200 metres across the peninsula, enclosing roughly 20 hectares to the southeast. The bank itself reaches about 2 metres in external height at its more substantial southern end, with a flat-bottomed fosse nearly 18 metres wide at the top. At its northern end, the earthwork is absorbed into the defences of Rindown Castle, the medieval Anglo-Norman fortification that occupies the tip of the peninsula on Lough Ree. O'Conor and colleagues, writing in 2014, proposed that rather than an ancient promontory fort in the traditional sense, this bank and fosse may mark the southeastern edge of the medieval town of Rindown, functioning as a boundary between the urban settlement and the demesne land attached to the castle. A stone wall, running just to the southeast of the bank and parallel with it, appears to reinforce this interpretation. Rindown was a planned Anglo-Norman town, largely forgotten today, and the earthwork may be one of the few legible remnants of its intended limits.