What you are looking at is a ring-barrow, a type of prehistoric funerary monument in which a central burial mound is encircled by a fosse, essentially a ditch, and an outer earthen bank. At Lisculla, that outer bank has been almost entirely ploughed away, and the fosse itself is now visible mainly as a darker band of vegetation, where moisture and disturbed soil encourage grass to grow differently from the surrounding field. It is the kind of archaeological trace that rewards attention rather than announcing itself.

The monument is roughly circular, measuring approximately 42.8 metres north-northeast to south-southwest and 41.5 metres east-southeast to west-northwest, making it a substantial structure even in its reduced state. The low, flat-topped central mound still survives in fair condition, sitting at the centre of what would once have been a clearly defined earthwork. Ring-barrows are generally associated with the Bronze Age, though they continued to be used and adapted across a long span of prehistoric activity in Ireland. Their form, a raised central area set apart from the surrounding landscape by encircling earthworks, suggests their purpose was both practical and ceremonial, marking a burial as something separate, bounded, and significant. The Galway Archaeological Survey, compiled in association with University College Galway, recorded this example as part of a broader effort to document such monuments across the county before agricultural activity erases them further.