What remains is a subrectangular earthwork, roughly 30.5 metres along its north-east to south-west axis and 15 metres across, defined by a scarp, an intervening fosse (a defensive ditch), and an outer bank. The north-west and north-east sides retain the clearest traces of this arrangement, but along the south-west the earthwork has vanished entirely from the surface, and only the inner scarp survives along the south-east. It is the kind of site that rewards patience and a low sun angle rather than a casual glance.

At the centre of this enclosure sit the remains of Moylough Castle, and the relationship between the two structures is the quietly interesting part. Claffey, writing in 1983, proposed that the castle and the surrounding earthwork are broadly contemporary, suggesting the earthen boundary was laid out as part of the same medieval planning that produced the castle rather than being an older feature later absorbed or reused. Some 30 metres to the north and east, a further series of rectangular earthworks enclosed by earthen banks complicates the picture agreeably; these are considered probably associated with the main enclosure, hinting that what survives today is only a remnant of a once more extensive arrangement of banks, ditches, and defined spaces across this corner of the undulating north Galway landscape.