It is not dramatic in scale, reaching only about a metre in height and six metres across, and it is interrupted here and there by small gaps in the bank. Yet this quiet linear earthwork at Lissooleen rewards attention precisely because of what it refuses to explain about itself. Its purpose is unrecorded, its date unknown, and even its physical form raises questions that sit comfortably unanswered.

The bank appears to have been built by throwing up earth from both sides, creating a central ridge, though the western face is noticeably higher than the eastern. That asymmetry is probably explained by proximity to the river, which runs along the western side. What is less easy to account for is the possibility, noted during fieldwork in the late 1990s, that burnt mounds may have been constructed on or against the bank itself. Burnt mounds, which are accumulations of fire-cracked stone typically associated with prehistoric cooking, water-heating, or industrial activity, are a common feature of Irish river margins, and finding them in association with a linear earthwork adds a layer of interpretive complexity. It is not clear whether the mounds predate the bank, postdate it, or were simply deposited nearby and subsequently merged with it over time. The earthwork is constructed from a mixture of earth and stones, which may itself reflect episodes of accumulation rather than a single organised building event.