Ring-ditches are generally understood to be the circular or near-circular ditched enclosures that once surrounded burial mounds or ritual monuments, the mounds themselves long since ploughed or eroded away, leaving only the ditch as a trace in the ground. This one at Mweelra has never been excavated and has never been seen, in any conventional sense, at all.

The feature was identified in 2005 through geophysical survey work carried out by Dr. Roseanne Schot, whose subsequent research also referenced it in 2011. It sits on a low rise within the western part of a larger hilltop enclosure, roughly 65 metres to the south-west of a nearby mound. What the survey detected was a semi-circular band of positive magnetic values running clockwise from north to south-east, suggesting a projected diameter of around 9 metres. At the centre of this arc there appears to be a pit, and to the north the magnetic responses intensify, accompanied by a scatter of linear and curvilinear features whose precise nature remains unclear but which are considered likely to be archaeological in origin. The incompleteness of the semi-circle, the unresolved pit, the ambiguous features clustering nearby, all of it amounts to a site that raises more questions than it answers.