It is a monument in the most literal sense, a feature old enough to be catalogued alongside ringforts, cashels, and the other earthworks that dot the west of Ireland, yet quiet enough that detailed documentation has not yet reached the public record.

Enclosures of this kind in Mayo can take many forms. Some are the remains of ringforts, the circular or oval earthen banks that once surrounded early medieval farmsteads, occupied roughly between the fifth and twelfth centuries. Others may be later field systems, ecclesiastical enclosures, or the degraded outlines of settlement features that predate written history entirely. The townland name Carrowbeg derives from the Irish An Cheathrú Bheag, meaning the small quarter, a reference to the old Gaelic land division system in which a quarter was a unit of agricultural land. That naming suggests a place long understood in terms of what could be worked and held, which makes the presence of an enclosure unsurprising, even if its specific character and date remain unclear.