An oval earthwork platform, roughly fifty metres along its longer north-west to south-east axis and about forty metres across, sits quietly overgrown in the field. Its edges are defined by a scarp, a deliberate drop in the ground that marks the boundary of the enclosed space, with remnants of stone walling still visible along the southern side. This kind of enclosure is a fairly common feature of the Irish landscape, but what makes Coolbane unusual is what lies inside it.

Within the platform there is a burial ground. The combination of enclosure and internal cemetery points toward a pattern seen elsewhere in Ireland, where early ecclesiastical or communal sites were established within, or later absorbed into, pre-existing earthwork enclosures. The circular or oval form is often associated with early medieval settlement or religious activity, and the presence of a burial ground inside suggests the site had a significance that outlasted whatever original purpose the enclosure served. The stone walling to the south may represent later structural activity on the site, though the heavy overgrowth now makes close reading of the remains difficult.