It measured roughly thirty metres north to south and twenty-five metres east to west. By the time anyone went to look for it properly, it was gone, levelled into the surrounding farmland without leaving any visible trace on the ground.

The site was recorded and compiled by Denis Power, with notes uploaded in August 2011, and the language of the record is notably cautious. The monument has been levelled, no trace was evident on inspection, and the enclosure's original purpose remains uncertain. What the notes do offer is a suggestive detail: a flood bank runs along the northern edge of the estuary inlet, and the enclosure once abutted this bank at its north-western corner. The working theory, tentative as it is, holds that the enclosure may have formed part of a flood-bank system, the kind of earthwork built to manage tidal or seasonal inundation along low-lying estuarine ground. Such systems were common enough along the Shannon margins, where the line between productive pasture and waterlogged ground depended on careful, ongoing management of embankments and drainage channels.

For anyone making their way out to Ballymartin, the site sits in farmland close to the Shannon estuary, and there is little to see at the enclosure itself. The flood bank to the north is the more legible feature in the landscape now, and it gives a sense of the hydrological logic that may once have tied the two structures together. The interest here is less in what survives than in the gap between a mapped enclosure and an empty field, and in what that gap says about how quickly earthworks, once maintained for a practical purpose, can disappear once that purpose no longer needs serving.