What survives at Dangan is a cashel, a type of ringfort defined by a roughly circular or oval enclosure of earth and stone rather than a simple earthen bank. These were typically farmsteads of the early medieval period, home to a single family and their livestock, and thousands of them survive across Ireland in varying states of preservation. This one is oval in plan, measuring roughly 27.5 metres northwest to southeast and 25 metres northeast to southwest, with a bank that reads differently depending on which side you approach from: the interior face rises only about 0.4 metres, while the exterior face stands closer to 0.8 metres, giving the whole structure a more imposing outward profile than the interior suggests.

The enclosure is defined by an earth and stone bank running from the south around the west to the northeast, and by a broad levelled scarp, essentially a flattened earthen step, completing the circuit from the northeast back around to the south. The bank itself is substantial, around 6.3 metres wide overall, with a flattened top roughly 2.6 metres across. At some point, farmers working the surrounding land deposited field clearance boulders along the southwestern and western arc of the bank, a common fate for old earthworks that found themselves incorporated into working agricultural landscapes. Whitethorn trees, also known as hawthorn, have taken hold along the northern arc, which is itself significant: hawthorn growing on or around a ringfort is a familiar sight in rural Ireland, where a longstanding tradition associated such trees with protective or otherworldly qualities, making people reluctant to cut them down even when clearing scrub elsewhere.

The interior of the cashel is largely inaccessible now, choked with briars and thorn trees that have colonised the enclosed ground. The monument sits on a gentle north-facing slope in improved pasture, with woodland visible to the west, and the low rise on which it stands gives it a quiet command of the immediate surroundings that would have made good practical sense to whoever chose the spot, perhaps fifteen hundred years ago or more.