Low earthen banks, barely rising above the surrounding grass, trace the outlines of a series of fields that once organised this corner of County Mayo into a working, parcelled-out territory. The banks are the kind of feature that a person on foot could walk past without registering, yet from the air they resolve into something coherent and extensive, a ghostly geometry pressed into the land.

The clearest evidence for what lies here came from an aerial photograph taken in 1970 by the Cambridge University Collection of Aerial Photography, which captured the full spread of the earthworks. That image showed how broadly the field system extended, the low banks defining multiple enclosures across a considerable area. A related field system also exists to the south, suggesting that this was not an isolated pocket of early land management but part of a wider pattern of settlement and farming in the district around Lough Mask and Lough Carra. Field systems of this type, where boundaries are formed by accumulated earth rather than stone walls, are found across Ireland and can date from prehistoric, early medieval, or later periods; without excavation, precise dating is difficult, and the earthworks at Ellistronparks have not been firmly placed in time.