It measures just over thirteen metres across and rises only thirty centimetres at its highest point, which is modest even by the standards of prehistoric burial mounds. At its centre there is a shallow, rush-filled depression, and along its southern edge a curving hollow, roughly a metre wide, that may once have been a fosse, the encircling ditch that typically accompanied such monuments in life and helped define them as set-apart, ceremonial ground.

Barrows are among the most widespread funerary monuments in the Irish landscape, raised during the Bronze Age as markers for the dead, though their exact function and the identities of those interred within them are rarely recoverable without excavation. This particular example at Ballyinsheen Beg belongs to a loose cluster; two comparable mounds are visible from the same ridge, one roughly a hundred and seventy metres to the north-north-east, another about a hundred and thirty-five metres to the east-south-east. The grouping suggests deliberate placement, a chosen upland location with wide views, which is a recurring feature of Bronze Age funerary landscapes across Ireland. A modern gap cut into the north-western edge of the mound is a reminder that these sites have not always been treated as monuments; whether it was made for drainage, livestock movement, or simple convenience is unrecorded.

The site sits in rough pasture and the terrain is boggy, so the ground underfoot is uneven and wet for much of the year. The mound itself is subtle enough that it rewards careful looking rather than a quick glance; the rush-filled central dip and the faint southern depression become more legible once you are standing at the edge of the mound and reading the ground level by level.