Twelve metres across and barely forty centimetres high, it is the kind of feature that is easy to walk across without registering as anything other than a slight unevenness in a field. Its edges are indistinct, its surface grass-covered, and nothing about it announces itself. What makes it quietly peculiar is its near-absence from the cartographic record: it appears on the 1907 edition of the Ordnance Survey six-inch map, but not on earlier editions, which raises the question of whether it was overlooked, obscured, or simply not considered worth marking until someone, at some point, decided it was.

The mound at Drumroosk has not been excavated, and its origins remain unclassified. Circular earthen mounds of this kind in Ireland can represent a range of things, from prehistoric burial cairns to the eroded remnants of ringforts or platform constructions associated with early medieval settlement, though without excavation it is impossible to say which, if any, applies here. What the landscape does offer is context: roughly a hundred metres to the north-north-west lies Coolkill church, a medieval ecclesiastical site, suggesting that this corner of Leitrim was, at some point, a place of some local significance. The proximity of the lough shore would have made the area accessible by water as well as land, which was no small consideration in a county where lakes and rivers long served as the principal routes of movement.