Ringforts, known in Irish as ráth or lios depending on their construction, were the most common form of rural settlement in early medieval Ireland, typically enclosing a single family's home and outbuildings within a raised bank and ditch. Tens of thousands were built across the country, yet each one occupies a specific patch of ground chosen by specific people for reasons of drainage, visibility, or proximity to good land, and most of those reasons are now lost to us.

The townland name Lislea itself carries a trace of this history. "Lis" derives from the Irish lios, meaning a ringfort or enclosure, suggesting that the presence of such a monument was significant enough to shape how local people named the land around them. This is not uncommon in Ireland, where placenames frequently preserve the memory of earthworks that have since eroded or been ploughed away entirely. That this particular fort survives as a recorded monument in Galway points to at least some degree of preservation above ground, though the details of its condition and dimensions remain, for now, unverified in any publicly available source.