Its outline, roughly subcircular and measuring approximately 47 metres east to west and 43 metres north to south, can only be traced in fragments. A low bank survives from the north-north-east around to the east-south-east, and again from the south-west to the north-west, but between those arcs the enclosing element has vanished entirely from view on one side, while on another a later field wall has been pressed into service as a substitute boundary. The hill gave whoever built here a clear vantage, but the site itself gives very little back to the casual observer.

Within the north-east quadrant of the interior, a rectangular structure survives as a low earthen bank, possibly the remains of an associated house. Whether the enclosure and the structure are broadly contemporary is not recorded, but the ensemble sits within a landscape that was clearly well used in earlier centuries. Roughly 180 metres to the south-west lies a ringfort, a type of enclosed farmstead common across early medieval Ireland, typically consisting of a circular bank and ditch surrounding a domestic space. The proximity of the two sites suggests this corner of north Galway was more densely settled and organised than its present quietness implies. The enclosure at Mausrevagh does not announce itself; it requires a certain patience and a willingness to read very faint earthworks as the residue of something deliberate.