These enclosures, typically defined by a curving bank or wall, were the fundamental unit of early Christian settlement in Ireland, containing a church, burial ground, and often the domestic buildings of a small monastic or pastoral community. The circular or sub-circular form that distinguishes them from later, more rectilinear ecclesiastical sites is frequently the oldest visible element remaining, long outlasting whatever structures once stood within.

The townland name Carrowrevagh derives from the Irish, with "carrow" reflecting a quarter-land division, a unit of land tenure common across Connacht. Mayo itself contains a remarkable density of early medieval ecclesiastical sites, a legacy of the intense monastic activity that characterised the west of Ireland from roughly the fifth century onwards. Without more detailed documentation, the precise origins and character of this particular enclosure remain difficult to recover, though its classification and survival as a recorded monument indicate that enough of its form persists in the ground to be recognisable as a distinct and deliberate feature of the historic landscape.