It is easy to mistake for a natural undulation in the field, yet the geometry gives it away: a roughly oval bank of earth, measuring just over thirteen metres north to south and nearly eleven and a half metres east to west, curling around a slightly hollow centre. That interior depression is the quiet giveaway. This is a barrow, a burial mound of the kind raised during prehistoric Ireland, typically during the Bronze Age, as a monument to the dead. The bank at its widest reaches almost five metres across, and the earthwork survives in fair condition, best preserved along its eastern, southern, and south-western arc.

Barrows of this type were not simply graves. They were statements about place and memory, often sited on elevated or visible ground precisely so they could be seen and known. Whoever chose this particular hill above Cappataggle understood the same logic, positioning the monument where it commands its surroundings. The name Lissatrim may offer a further layer of meaning; the element "lios" in Irish place-names generally refers to an enclosure, which broadly describes the form of the monument, though the two traditions, burial mound and enclosure, are not always easy to separate on the ground after millennia of weathering and reuse.